URGENT E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #3

[belaldaboul]

crash at runtime on payfort lib when I import amplify / proguard enabled

logcat:
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:353)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.VerifyError: Verifier rejected class com.payfort.sdk.android.dependancies.security.aes.AESCipher: java.lang.String com.payfort.sdk.android.dependancies.security.aes.AESCipher.getDecryptedMessage(java.lang.String) failed to verify: java.lang.String com.payfort.sdk.android.dependancies.security.aes.AESCipher.getDecryptedMessage(java.lang.String): [0x10] 'this' argument 'Precise Reference: org.apache.commons.codec.binary.Base64' not instance of 'Reference: org.apache.commons.codec.binary.BaseNCodec' (declaration of 'com.payfort.sdk.android.dependancies.security.aes.AESCipher' appears in /data/app/-xLeTPVH9ZKVCDB3vLbGFbg==/base.apk!classes3.dex)
at com.payfort.sdk.android.dependancies.security.aes.AESCipherManager.encryptData(AESCipherManager.java:22)
at com.payfort.sdk.android.dependancies.security.DataSecurityService.encryptRequestData(DataSecurityService.java:57)
at com.payfort.fort.android.sdk.activities.InitSecureConnectionActivity$Handshake.doInBackground(InitSecureConnectionActivity.java:138)
at com.payfort.fort.android.sdk.activities.InitSecureConnectionActivity$Handshake.doInBackground(InitSecureConnectionActivity.java:105)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)