Cobertura 2.0.2 and Java 6 problem

[Holmes, D. <Dan...@ne...>]

[cobertura:instrument] WARN   warn, Problems instrumenting archive entry: package/MyClass.class
[cobertura:instrument] java.lang.IncompatibleClassChangeError: net/sourceforge/cobertura/instrument/pass1/DetectIgnoredCodeClassVisitor
[cobertura:instrument] 	at net.sourceforge.cobertura.instrument.CoberturaInstrumenter.instrumentClass(CoberturaInstrumenter.java:149)
[cobertura:instrument] 	at net.sourceforge.cobertura.instrument.Main.addInstrumentationToArchive(Main.java:143)
[cobertura:instrument] 	at net.sourceforge.cobertura.instrument.Main.addInstrumentationToArchive(Main.java:242)
[cobertura:instrument] 	at net.sourceforge.cobertura.instrument.Main.parseArguments(Main.java:371)
[cobertura:instrument] 	at net.sourceforge.cobertura.instrument.Main.main(Main.java:395)

I'm running exact same build as previous, just having swapped 1.9.4.1 for 2.0.2 of cobertura

javac -version
javac 1.6.0_43

Sounds from what I could find about this error it means the class resulting from the instrumentation is not java 1.6 compatible?  Is there a flag I need to add to the instrument task or is this a cobertura bug.

Daniel