Generate_IIS : You cannot call a method on a null-valued expression.
At C:\Program Files\WindowsPowerShell\Modules\image2docker\1.8.2\Functions\Private\GenerateDockerfile.ps1:34 char:23
+ ... ockerfile = & "Generate_$Artifact" -MountPath $MountPath -ManifestPat ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Generate_IIS], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull,Generate_IIS

PS C:\> ConvertTo-Dockerfile -ImagePath D:\Win2008r2Std-Gen1_boot.vhdx -Verbose -OutputPath d:\iis2

cmdlet ConvertTo-Dockerfile at command pipeline position 1
Supply values for the following parameters:
Artifact: iis