Well, in short-- it means Java canāt find a method with that declaration. Specifically, it canāt find a method called āparseā in in the āorg.mozilla.javascript.Parserā class that accepts a Reader, String, and int, in that order, and returns a ScriptOrFnNode obejct.
Is there an older version of the jar kicking around your classpath? Check what jars the plugin loads and try to see if theyāre loading correct and if there are any other copies of them floating around your install.