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When deleting projects which were generated by netbeans-freeform-maven-plugin (project group), it threw the java.lang.AssertionError, this shouldn't be caused by that maven-plugin. And when I was going to exit NetBeans, another java.lang.AssertionError was thrown.
Created attachment 26508 [details] Error log
The "java.lang.AssertionError: Got change from"s are duplicate of issue #66195. The last AssertionError has been fixed as of revision 1.4 of org.netbeans.modules.editor.bookmarks.PersistentBookmarks. Thanks for the report. *** This issue has been marked as a duplicate of 66195 ***