I am trying to use your plugin on my grammar in NetBeans 11.1 as ANTLRWORKS 2 uses rather outdated NetBeans.
This grammar works fine in ANTLRWORKS 2 against the input file I have set up in the attached settings, but results in failure in your plugin.
I assume this failure results from your plugin running "something" (as there doesn't seem to be any real documentation). When I click on the red "Failed" banner I see the following pop-up:
I am not sure whether this empty set is the result of my grammar, or whether it is something else