Exception occurred during Code Completion Database rebuilding
java.lang.IllegalArgumentException: org.openide.awt..Toolbar.Patch.
        at org.openide.src.Identifier.initNamePos(Identifier.java:86)
        at org.openide.src.Identifier.create(Identifier.java:129)
        at org.netbeans.modules.clazz.ClassElementImpl.createName(ClassElementImpl.java:102)
        at org.netbeans.modules.clazz.MemberElementImpl.getName(MemberElementImpl.java:66)
        at org.openide.src.MemberElement.getName(MemberElement.java:81)
        at org.netbeans.modules.clazz.SourceElementImpl.addClassElement(SourceElementImpl.java:246)
        at org.netbeans.modules.clazz.SourceElementImpl.createClassesMap(SourceElementImpl.java:238)
        at org.netbeans.modules.clazz.SourceElementImpl.getAllClassesMap(SourceElementImpl.java:221)
        at org.netbeans.modules.clazz.SourceElementImpl.getAllClasses(SourceElementImpl.java:151)
        at org.openide.src.SourceElement.getAllClasses(SourceElement.java:242)
        at org.netbeans.modules.editor.java.JCUpdater.appendSource(JCUpdater.java:373)
        at org.netbeans.modules.editor.java.JCUpdater.updateProviderOnBackground(JCUpdater.java:660)
        at org.netbeans.modules.editor.java.JCUpdater.processNode(JCUpdater.java:253)
        at org.netbeans.modules.editor.java.JCUpdater.run(JCUpdater.java:170)