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Check out contrib/packager Open org.netbeans.modules.packager.ui.PackagerCustomizer and make some change Try to compile the module The problem is, the form was generated with the listener generation style set to main-class. When it is reopened in the form editor, the code is regenerated as inner-class listeners - but the class definition still has it implementing the listener interfaces it formerly had. Probably the listener generation style the form was generated with should be encoded in the form data somewhere...
It is already fixed - the listener generation style is stored in .form file. Unfortunately old forms don't contain this information - you have to open the file and change Listener Generation Style property of the form root node. The listener generation style will be stored in the .form file then. *** This issue has been marked as a duplicate of 41009 ***