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[warn] :: org.scalastyle#scalastyle-sbt-plugin;1.0.0: Resolution failed several times for dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0 {compile=[default(compile)]}::
[warn] :: com.eed3si9n#sbt-assembly;0.14.6: Resolution failed several times for dependency: com.eed3si9n#sbt-assembly;0.14.6 {compile=[default(compile)]}::
[warn] :: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: Resolution failed several times for dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4 {compile=[default(compile)]}::
[error] sbt.librarymanagement.ResolveException: unresolved dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0: Resolution failed several times for dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0 {compile=[default(compile)]}::
[error] unresolved dependency: com.eed3si9n#sbt-unidoc;0.4.1: Resolution failed several times for dependency: com.eed3si9n#sbt-unidoc;0.4.1 {compile=[default(compile)]}::
[error] unresolved dependency: com.eed3si9n#sbt-assembly;0.14.6: Resolution failed several times for dependency: com.eed3si9n#sbt-assembly;0.14.6 {compile=[default(compile)]}::
[error] unresolved dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: Resolution failed several times for dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4 {compile=[default(compile)]}::
[error] at sbt.internal.librarymanagement.IvyActions$.resolveAndRetrieve(IvyActions.scala:332)
[error] at sbt.internal.librarymanagement.IvyActions$.$anonfun$updateEither$1(IvyActions.scala:208)
[error] at sbt.internal.librarymanagement.IvyActions$$$Lambda$2046/2102670054.apply(Unknown Source)
[error] at sbt.internal.librarymanagement.IvySbt$Module.$anonfun$withModule$1(Ivy.scala:239)
[error] at sbt.internal.librarymanagement.IvySbt$Module$$Lambda$2047/2028935944.apply(Unknown Source)
[error] at sbt.internal.librarymanagement.IvySbt.$anonfun$withIvy$1(Ivy.scala:204)
[error] at sbt.internal.librarymanagement.IvySbt$$Lambda$2048/1742855735.apply(Unknown Source)
[error] at sbt.internal.librarymanagement.IvySbt.sbt$internal$librarymanagement$IvySbt$$action$1(Ivy.scala:70)
[error] at sbt.internal.librarymanagement.IvySbt$$anon$3.call(Ivy.scala:77)
[error] at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:95)
[error] at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:80)
[error] at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:99)
[error] at xsbt.boot.Using$.withResource(Using.scala:10)
[error] at xsbt.boot.Using$.apply(Using.scala:9)
[error] at xsbt.boot.Locks$GlobalLock.ignoringDeadlockAvoided(Locks.scala:60)
[error] at xsbt.boot.Locks$GlobalLock.withLock(Locks.scala:50)
[error] at xsbt.boot.Locks$.apply0(Locks.scala:31)
[error] at xsbt.boot.Locks$.apply(Locks.scala:28)
[error] at sbt.internal.librarymanagement.IvySbt.withDefaultLogger(Ivy.scala:77)
[error] at sbt.internal.librarymanagement.IvySbt.withIvy(Ivy.scala:199)
[error] at sbt.internal.librarymanagement.IvySbt.withIvy(Ivy.scala:196)
[error] at sbt.internal.librarymanagement.IvySbt$Module.withModule(Ivy.scala:238)
[error] at sbt.internal.librarymanagement.IvyActions$.updateEither(IvyActions.scala:193)
[error] at sbt.librarymanagement.ivy.IvyDependencyResolution.update(IvyDependencyResolution.scala:20)
[error] at sbt.librarymanagement.DependencyResolution.update(DependencyResolution.scala:56)
[error] at sbt.internal.LibraryManagement$.resolve$1(LibraryManagement.scala:45)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$12(LibraryManagement.scala:93)
[error] at sbt.internal.LibraryManagement$$$Lambda$2042/15614067.apply(Unknown Source)
[error] at sbt.util.Tracked$.$anonfun$lastOutput$1(Tracked.scala:68)
[error] at sbt.util.Tracked$$$Lambda$1995/210783352.apply(Unknown Source)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$19(LibraryManagement.scala:106)
[error] at sbt.internal.LibraryManagement$$$Lambda$2044/2127972338.apply(Unknown Source)
[error] at scala.util.control.Exception$Catch.apply(Exception.scala:224)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$11(LibraryManagement.scala:106)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$11$adapted(LibraryManagement.scala:89)
[error] at sbt.internal.LibraryManagement$$$Lambda$2041/1165783538.apply(Unknown Source)
[error] at sbt.util.Tracked$.$anonfun$inputChanged$1(Tracked.scala:149)
[error] at sbt.util.Tracked$$$Lambda$1952/381561154.apply(Unknown Source)
[error] at sbt.internal.LibraryManagement$.cachedUpdate(LibraryManagement.scala:120)
[error] at sbt.Classpaths$.$anonfun$updateTask$5(Defaults.scala:2561)
[error] at sbt.Classpaths$$$Lambda$1126/1845746463.apply(Unknown Source)
[error] at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] at scala.Function1$$Lambda$1015/1917860633.apply(Unknown Source)
[error] at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] at sbt.internal.util.$tilde$greater$$Lambda$1866/1955991197.apply(Unknown Source)
[error] at sbt.std.Transform$$anon$4.work(System.scala:67)
[error] at sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] at sbt.Execute$$Lambda$1882/1674882807.apply(Unknown Source)
[error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] at sbt.Execute.work(Execute.scala:278)
[error] at sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] at sbt.Execute$$Lambda$1874/1133731484.apply(Unknown Source)
[error] at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] at sbt.ConcurrentRestrictions$$anon$4$$Lambda$1881/177267393.apply(Unknown Source)
[error] at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[error] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[error] at java.lang.Thread.run(Thread.java:745)
[error] (update) sbt.librarymanagement.ResolveException: unresolved dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0: Resolution failed several times for dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0 {compile=[default(compile)]}::
[error] unresolved dependency: com.eed3si9n#sbt-unidoc;0.4.1: Resolution failed several times for dependency: com.eed3si9n#sbt-unidoc;0.4.1 {compile=[default(compile)]}::
[error] unresolved dependency: com.eed3si9n#sbt-assembly;0.14.6: Resolution failed several times for dependency: com.eed3si9n#sbt-assembly;0.14.6 {compile=[default(compile)]}::
[error] unresolved dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: Resolution failed several times for dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4 {compile=[default(compile)]}::
Indeed, googling sbt PKIX path building failed brings many results. I'd suggest trying all the answers from this StackOverflow question. Are you (or the student) perhaps behind a corporate/university proxy messing with TLS certificates?
One of you had this problem while running sbt:
sbt deploy
[info] Loading settings for project src-build from plugins.sbt,project.sbt ...
[info] Loading project definition from /Users/sorenschlassa/MMT/src/project
[info] Updating ProjectRef(uri("file:/Users/sorenschlassa/MMT/src/project/"), "src-build")...
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: UNRESOLVED DEPENDENCIES ::
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: org.scalastyle#scalastyle-sbt-plugin;1.0.0: Resolution failed several times for dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0 {compile=[default(compile)]}::
[warn] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] sbt-plugin-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/org.scalastyle/scalastyle-sbt-plugin/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/1.0.0/jars/scalastyle-sbt-plugin.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/1.0.0/jars/scalastyle-sbt-plugin.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] :: com.eed3si9n#sbt-unidoc;0.4.1: Resolution failed several times for dependency: com.eed3si9n#sbt-unidoc;0.4.1 {compile=[default(compile)]}::
[warn] typesafe-ivy-releases: unable to get resource for com.eed3si9n#sbt-unidoc;0.4.1: res=https://repo.typesafe.com/typesafe/ivy-releases/com.eed3si9n/sbt-unidoc/scala_2.12/sbt_1.0/0.4.1/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] sbt-plugin-releases: unable to get resource for com.eed3si9n#sbt-unidoc;0.4.1: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-unidoc/scala_2.12/sbt_1.0/0.4.1/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] :: com.eed3si9n#sbt-assembly;0.14.6: Resolution failed several times for dependency: com.eed3si9n#sbt-assembly;0.14.6 {compile=[default(compile)]}::
[warn] typesafe-ivy-releases: unable to get resource for com.eed3si9n#sbt-assembly;0.14.6: res=https://repo.typesafe.com/typesafe/ivy-releases/com.eed3si9n/sbt-assembly/scala_2.12/sbt_1.0/0.14.6/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] sbt-plugin-releases: unable to get resource for com.eed3si9n#sbt-assembly;0.14.6: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-assembly/scala_2.12/sbt_1.0/0.14.6/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] :: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: Resolution failed several times for dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4 {compile=[default(compile)]}::
[warn] typesafe-ivy-releases: unable to get resource for com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: res=https://repo.typesafe.com/typesafe/ivy-releases/com.typesafe.sbteclipse/sbteclipse-plugin/scala_2.12/sbt_1.0/5.2.4/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] sbt-plugin-releases: unable to get resource for com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.typesafe.sbteclipse/sbteclipse-plugin/scala_2.12/sbt_1.0/5.2.4/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn]
[warn] Note: Some unresolved dependencies have extra attributes. Check that these dependencies exist with the requested attributes.
[warn] org.scalastyle:scalastyle-sbt-plugin:1.0.0 (scalaVersion=2.12, sbtVersion=1.0)
[warn] com.eed3si9n:sbt-unidoc:0.4.1 (scalaVersion=2.12, sbtVersion=1.0)
[warn] com.eed3si9n:sbt-assembly:0.14.6 (scalaVersion=2.12, sbtVersion=1.0)
[warn] com.typesafe.sbteclipse:sbteclipse-plugin:5.2.4 (scalaVersion=2.12, sbtVersion=1.0)
[warn]
[warn] Note: Unresolved dependencies path:
[warn] org.scalastyle:scalastyle-sbt-plugin:1.0.0 (scalaVersion=2.12, sbtVersion=1.0) (/Users/sorenschlassa/MMT/src/project/plugins.sbt#L3-4)
[warn] +- default:src-build:0.1.0-SNAPSHOT (scalaVersion=2.12, sbtVersion=1.0)
[warn] com.eed3si9n:sbt-unidoc:0.4.1 (scalaVersion=2.12, sbtVersion=1.0) (/Users/sorenschlassa/MMT/src/project/plugins.sbt#L5-6)
[warn] +- default:src-build:0.1.0-SNAPSHOT (scalaVersion=2.12, sbtVersion=1.0)
[warn] com.eed3si9n:sbt-assembly:0.14.6 (scalaVersion=2.12, sbtVersion=1.0) (/Users/sorenschlassa/MMT/src/project/plugins.sbt#L6-7)
[warn] +- default:src-build:0.1.0-SNAPSHOT (scalaVersion=2.12, sbtVersion=1.0)
[warn] com.typesafe.sbteclipse:sbteclipse-plugin:5.2.4 (scalaVersion=2.12, sbtVersion=1.0) (/Users/sorenschlassa/MMT/src/project/plugins.sbt#L8-9)
[warn] +- default:src-build:0.1.0-SNAPSHOT (scalaVersion=2.12, sbtVersion=1.0)
[error] sbt.librarymanagement.ResolveException: unresolved dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0: Resolution failed several times for dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/org.scalastyle/scalastyle-sbt-plugin/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/1.0.0/jars/scalastyle-sbt-plugin.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/1.0.0/jars/scalastyle-sbt-plugin.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] unresolved dependency: com.eed3si9n#sbt-unidoc;0.4.1: Resolution failed several times for dependency: com.eed3si9n#sbt-unidoc;0.4.1 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for com.eed3si9n#sbt-unidoc;0.4.1: res=https://repo.typesafe.com/typesafe/ivy-releases/com.eed3si9n/sbt-unidoc/scala_2.12/sbt_1.0/0.4.1/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for com.eed3si9n#sbt-unidoc;0.4.1: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-unidoc/scala_2.12/sbt_1.0/0.4.1/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] unresolved dependency: com.eed3si9n#sbt-assembly;0.14.6: Resolution failed several times for dependency: com.eed3si9n#sbt-assembly;0.14.6 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for com.eed3si9n#sbt-assembly;0.14.6: res=https://repo.typesafe.com/typesafe/ivy-releases/com.eed3si9n/sbt-assembly/scala_2.12/sbt_1.0/0.14.6/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for com.eed3si9n#sbt-assembly;0.14.6: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-assembly/scala_2.12/sbt_1.0/0.14.6/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] unresolved dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: Resolution failed several times for dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: res=https://repo.typesafe.com/typesafe/ivy-releases/com.typesafe.sbteclipse/sbteclipse-plugin/scala_2.12/sbt_1.0/5.2.4/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.typesafe.sbteclipse/sbteclipse-plugin/scala_2.12/sbt_1.0/5.2.4/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] at sbt.internal.librarymanagement.IvyActions$.resolveAndRetrieve(IvyActions.scala:332)
[error] at sbt.internal.librarymanagement.IvyActions$.$anonfun$updateEither$1(IvyActions.scala:208)
[error] at sbt.internal.librarymanagement.IvyActions$$$Lambda$2046/2102670054.apply(Unknown Source)
[error] at sbt.internal.librarymanagement.IvySbt$Module.$anonfun$withModule$1(Ivy.scala:239)
[error] at sbt.internal.librarymanagement.IvySbt$Module$$Lambda$2047/2028935944.apply(Unknown Source)
[error] at sbt.internal.librarymanagement.IvySbt.$anonfun$withIvy$1(Ivy.scala:204)
[error] at sbt.internal.librarymanagement.IvySbt$$Lambda$2048/1742855735.apply(Unknown Source)
[error] at sbt.internal.librarymanagement.IvySbt.sbt$internal$librarymanagement$IvySbt$$action$1(Ivy.scala:70)
[error] at sbt.internal.librarymanagement.IvySbt$$anon$3.call(Ivy.scala:77)
[error] at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:95)
[error] at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:80)
[error] at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:99)
[error] at xsbt.boot.Using$.withResource(Using.scala:10)
[error] at xsbt.boot.Using$.apply(Using.scala:9)
[error] at xsbt.boot.Locks$GlobalLock.ignoringDeadlockAvoided(Locks.scala:60)
[error] at xsbt.boot.Locks$GlobalLock.withLock(Locks.scala:50)
[error] at xsbt.boot.Locks$.apply0(Locks.scala:31)
[error] at xsbt.boot.Locks$.apply(Locks.scala:28)
[error] at sbt.internal.librarymanagement.IvySbt.withDefaultLogger(Ivy.scala:77)
[error] at sbt.internal.librarymanagement.IvySbt.withIvy(Ivy.scala:199)
[error] at sbt.internal.librarymanagement.IvySbt.withIvy(Ivy.scala:196)
[error] at sbt.internal.librarymanagement.IvySbt$Module.withModule(Ivy.scala:238)
[error] at sbt.internal.librarymanagement.IvyActions$.updateEither(IvyActions.scala:193)
[error] at sbt.librarymanagement.ivy.IvyDependencyResolution.update(IvyDependencyResolution.scala:20)
[error] at sbt.librarymanagement.DependencyResolution.update(DependencyResolution.scala:56)
[error] at sbt.internal.LibraryManagement$.resolve$1(LibraryManagement.scala:45)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$12(LibraryManagement.scala:93)
[error] at sbt.internal.LibraryManagement$$$Lambda$2042/15614067.apply(Unknown Source)
[error] at sbt.util.Tracked$.$anonfun$lastOutput$1(Tracked.scala:68)
[error] at sbt.util.Tracked$$$Lambda$1995/210783352.apply(Unknown Source)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$19(LibraryManagement.scala:106)
[error] at sbt.internal.LibraryManagement$$$Lambda$2044/2127972338.apply(Unknown Source)
[error] at scala.util.control.Exception$Catch.apply(Exception.scala:224)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$11(LibraryManagement.scala:106)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$11$adapted(LibraryManagement.scala:89)
[error] at sbt.internal.LibraryManagement$$$Lambda$2041/1165783538.apply(Unknown Source)
[error] at sbt.util.Tracked$.$anonfun$inputChanged$1(Tracked.scala:149)
[error] at sbt.util.Tracked$$$Lambda$1952/381561154.apply(Unknown Source)
[error] at sbt.internal.LibraryManagement$.cachedUpdate(LibraryManagement.scala:120)
[error] at sbt.Classpaths$.$anonfun$updateTask$5(Defaults.scala:2561)
[error] at sbt.Classpaths$$$Lambda$1126/1845746463.apply(Unknown Source)
[error] at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] at scala.Function1$$Lambda$1015/1917860633.apply(Unknown Source)
[error] at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] at sbt.internal.util.$tilde$greater$$Lambda$1866/1955991197.apply(Unknown Source)
[error] at sbt.std.Transform$$anon$4.work(System.scala:67)
[error] at sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] at sbt.Execute$$Lambda$1882/1674882807.apply(Unknown Source)
[error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] at sbt.Execute.work(Execute.scala:278)
[error] at sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] at sbt.Execute$$Lambda$1874/1133731484.apply(Unknown Source)
[error] at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] at sbt.ConcurrentRestrictions$$anon$4$$Lambda$1881/177267393.apply(Unknown Source)
[error] at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[error] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[error] at java.lang.Thread.run(Thread.java:745)
[error] (update) sbt.librarymanagement.ResolveException: unresolved dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0: Resolution failed several times for dependency: org.scalastyle#scalastyle-sbt-plugin;1.0.0 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/org.scalastyle/scalastyle-sbt-plugin/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/1.0.0/jars/scalastyle-sbt-plugin.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] typesafe-ivy-releases: unable to get resource for org.scalastyle#scalastyle-sbt-plugin;1.0.0: res=https://repo.typesafe.com/typesafe/ivy-releases/org.scalastyle/scalastyle-sbt-plugin/1.0.0/jars/scalastyle-sbt-plugin.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] unresolved dependency: com.eed3si9n#sbt-unidoc;0.4.1: Resolution failed several times for dependency: com.eed3si9n#sbt-unidoc;0.4.1 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for com.eed3si9n#sbt-unidoc;0.4.1: res=https://repo.typesafe.com/typesafe/ivy-releases/com.eed3si9n/sbt-unidoc/scala_2.12/sbt_1.0/0.4.1/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for com.eed3si9n#sbt-unidoc;0.4.1: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-unidoc/scala_2.12/sbt_1.0/0.4.1/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] unresolved dependency: com.eed3si9n#sbt-assembly;0.14.6: Resolution failed several times for dependency: com.eed3si9n#sbt-assembly;0.14.6 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for com.eed3si9n#sbt-assembly;0.14.6: res=https://repo.typesafe.com/typesafe/ivy-releases/com.eed3si9n/sbt-assembly/scala_2.12/sbt_1.0/0.14.6/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for com.eed3si9n#sbt-assembly;0.14.6: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.eed3si9n/sbt-assembly/scala_2.12/sbt_1.0/0.14.6/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error]
[error] unresolved dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: Resolution failed several times for dependency: com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4 {compile=[default(compile)]}::
[error] typesafe-ivy-releases: unable to get resource for com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: res=https://repo.typesafe.com/typesafe/ivy-releases/com.typesafe.sbteclipse/sbteclipse-plugin/scala_2.12/sbt_1.0/5.2.4/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[error] sbt-plugin-releases: unable to get resource for com.typesafe.sbteclipse#sbteclipse-plugin;5.2.4: res=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.typesafe.sbteclipse/sbteclipse-plugin/scala_2.12/sbt_1.0/5.2.4/ivys/ivy.xml: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
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