VuGen Script Converter error on converting JUnit

I am trying to convert a JUnit to a VuGen script using the Performance Center utility - VuGen Script Converter. I have copied the class file and the dependent jars to the machine where the utility is present. When I click the Convert button, I get the error:

java.lang.IllegalArgumentException at org.objectweb.asm.ClassReader.<init>(UnknownSource)

The complete error is attached.

The JUnit has been compiled with Java 8. Is the Java version causing a problem?

Kindly advise.