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Probably you already know this issue and it's due to the in-progress-development-status of ProM 6.
I set up the dev environment for plugins implementation as explained in the documentation. First of all many compliments for the macro editor for combining plugin, it's really useful and simple to use. However, when launching the application, the plugin update procedure gives some warning of type:
"Method X is could not be added as a plugin. The context should be asked as first parameter and should be a the same, or a superclass of org.processmining.contexts.gui.GUIPluginContext. Plugin X could not be added as a plugin. At least one variant has to be specified".