org.netbeans.editor.GuardedException: Attempt to remove from guarded block at position 2,946.
   at org.netbeans.editor.GuardedDocument.preRemoveCheck(GuardedDocument.java:296)
   at org.netbeans.editor.BaseDocument.handleRemove(BaseDocument.java:967)
   at org.netbeans.editor.BaseDocument$FilterBypassImpl.remove(BaseDocument.java:2583)
   at javax.swing.text.DocumentFilter.remove(DocumentFilter.java:79)
   at org.openide.text.CloneableEditorSupport$DocFilter.remove(CloneableEditorSupport.java:2389)
   at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:931)
   at org.netbeans.api.java.source.ModificationResult.processDocumentLocked(ModificationResult.java:422)
   at org.netbeans.api.java.source.ModificationResult.access$100(ModificationResult.java:96)
   at org.netbeans.api.java.source.ModificationResult$3.run(ModificationResult.java:392)
   at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:356)
   at org.netbeans.editor.BaseDocument$ServicesImpl.runAtomicAsUser(BaseDocument.java:2669)
Caused: java.io.IOException
   at org.netbeans.api.java.source.ModificationResult.processDocument(ModificationResult.java:410)
   at org.netbeans.api.java.source.ModificationResult.commit2(ModificationResult.java:355)
   at org.netbeans.api.java.source.ModificationResult.access$000(ModificationResult.java:96)
   at org.netbeans.api.java.source.ModificationResult$2.run(ModificationResult.java:257)
   at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:323)
   at org.netbeans.editor.BaseDocument$ServicesImpl.runAtomic(BaseDocument.java:2664)
   at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:254)
   at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:208)
   at org.netbeans.modules.refactoring.java.spi.JavaModificationResult.commit(JavaModificationResult.java:74)
Caused: java.lang.RuntimeException: java.io.IOException
   at org.netbeans.modules.refactoring.spi.RefactoringCommit.commit(RefactoringCommit.java:165)
   at org.netbeans.modules.java.hints.spiimpl.refactoring.AbstractApplyHintsRefactoringPlugin$DelegatingTransaction.commit(AbstractApplyHintsRefactoringPlugin.java:450)
   at org.netbeans.modules.refactoring.api.RefactoringSession.reallyDoRefactoring(RefactoringSession.java:166)
   at org.netbeans.modules.refactoring.api.RefactoringSession.access$100(RefactoringSession.java:79)
   at org.netbeans.modules.refactoring.api.RefactoringSession$1.run(RefactoringSession.java:122)
   at org.netbeans.modules.refactoring.api.RefactoringSession$1.run(RefactoringSession.java:120)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks.runWithOnSaveTasksDisabled(BeforeSaveTasks.java:93)
   at org.netbeans.editor.Utilities.runWithOnSaveTasksDisabled(Utilities.java:1616)
   at org.netbeans.modules.refactoring.api.RefactoringSession.doRefactoring(RefactoringSession.java:120)
   at org.netbeans.modules.refactoring.spi.impl.RefactoringPanel$2.run(RefactoringPanel.java:575)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)