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java.lang.IllegalAccessError when parsing a Processing Sketch

whenever I try to parse a Processing Sketch (both in Java and in JavaScript mode) I get the following error: Exception in thread "AWT-EventQueue-0" java.lang ...
GitHub

java.lang.IllegalAccessError #109

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Bookshelf (bookshelf) Caused by: java.lang.IllegalAccessError: tried to access field net ...