Annotation: Exception occurred in Request Processor
java.lang.IllegalStateException: atomicUnlock() without atomicLock()
	at org.netbeans.editor.BaseDocument.atomicUnlockImpl(BaseDocument.java:1067)
	at org.netbeans.editor.BaseDocument.atomicUnlock(BaseDocument.java:1061)
	at org.netbeans.editor.BaseDocument.runAtomicAsUser(BaseDocument.java:914)
	at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:217)
	at org.openide.text.NbDocument.runAtomic(NbDocument.java:329)
	at org.netbeans.modules.java.parser.SourceImplProxy$2.run(SourceImplProxy.java:240)
	at org.netbeans.modules.java.model.DefaultLangModel.runAtomic(DefaultLangModel.java:472)
	at org.netbeans.modules.java.parser.SourceImplProxy.runAtomicAsUser(SourceImplProxy.java:236)
	at org.openide.src.SourceElement.runAtomicAsUser(SourceElement.java:287)
	at org.openide.src.nodes.SourceEditSupport.runAsUser(SourceEditSupport.java:299)
	at org.openide.src.nodes.SourceEditSupport.invokeAtomicAsUser(SourceEditSupport.java:273)
	at org.openide.src.nodes.ClassElementNode.destroy(ClassElementNode.java:128)
	at org.openide.nodes.FilterNode.destroy(FilterNode.java:451)
	at org.openide.explorer.ExplorerActions$1.run(ExplorerActions.java:674)
	at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:89)
	at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:414)
	at org.openide.explorer.ExplorerActions$DeleteActionPerformer.doDestroy(ExplorerActions.java:670)
	at org.openide.explorer.ExplorerActions$DeleteActionPerformer.performAction(ExplorerActions.java:614)
	at org.openide.explorer.ExplorerActions$DeleteActionPerformer.actionPerformed(ExplorerActions.java:692)
	at org.openide.util.actions.CallbackSystemAction$DelegateAction.actionPerformed(CallbackSystemAction.java:503)
	at org.netbeans.core.ModuleActions$1.run(ModuleActions.java:97)
	at org.openide.util.Task.run(Task.java:136)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:328)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:670)