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.exe file won't start

I have a java program which I have successfully converted into a jar.  When I use JAR2EXE, and try to execute the result, iget the message  "The Main Startup Class Could not be found".

As a console application the fault is

Exception in thread "main" java.lang.unsupportedClassVersionError: Baboon :Unsupported major.minor version 52.0

(My main class is Baboon)

This seems odd, because yesterday the trial version worked. Then I registered it and ...

PLease comment.  Thanks