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WARNING [org.openide.loaders.InstanceDataObject]: Instance file MultiFileObject@ee1c42[Editors/Actions/org-netbeans-modules-editor-bracesmatching-BracesMatchAction-select.instance] uses instanceCreate attribute, but doesn't define instanceClass attribute. Please add instanceClass attr to avoid multiple instances creation,see details at http://www.netbeans.org/issues/show_bug.cgi?id=131951 WARNING [org.openide.loaders.InstanceDataObject]: Instance file MultiFileObject@81460c[Editors/Actions/org-netbeans-modules-editor-bracesmatching-BracesMatchAction-navigate.instance] uses instanceCreate attribute, but doesn't define instanceClass attribute. Please add instanceClass attr to avoid multiple instances creation,see details at http://www.netbeans.org/issues/show_bug.cgi?id=131951
The same story as issue #142544 ...
Issue 131951 fixed - warning should not appear.