Exception in thread "main" java.lang.UnsupportedClassVersionError: Codechef has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime ...

java. lang. UnsupportedClassVersionError: (com / siperian / lookup / processor / FindTaskProcessor) bad major version at offset =6 (unable to load class com. siperian. lookup. processor.

Exception in thread "main" java.lang.UnsupportedClassVersionError: weka/gui/GUIChooser : Unsupported major.minor version 52.0 Probably not my place to say but you’re picking something up compiled with ...