org.netbeans.editor.GuardedException: Attempt to remove from guarded block at position 9.843.
        at org.netbeans.editor.GuardedDocument.preRemoveCheck(GuardedDocument.java:287)
        at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:891)
        at org.netbeans.api.java.source.ModificationResult.processDocumentLocked(ModificationResult.java:375)
        at org.netbeans.api.java.source.ModificationResult.access$100(ModificationResult.java:85)
        at org.netbeans.api.java.source.ModificationResult$3.run(ModificationResult.java:344)
        at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:354)
        at org.openide.text.NbDocument.runAtomicAsUser(NbDocument.java:410)
Caused: java.io.IOException
        at org.netbeans.api.java.source.ModificationResult.processDocument(ModificationResult.java:360)
        at org.netbeans.api.java.source.ModificationResult.commit2(ModificationResult.java:329)
        at org.netbeans.api.java.source.ModificationResult.access$000(ModificationResult.java:85)
        at org.netbeans.api.java.source.ModificationResult$2.run(ModificationResult.java:234)
        at org.netbeans.editor.GuardedDocument.runAtomic(GuardedDocument.java:324)
        at org.openide.text.NbDocument.runAtomic(NbDocument.java:384)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:231)
        at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:194)
        at org.netbeans.modules.java.hints.introduce.IntroduceHint$IntroduceMethodFix.implement(IntroduceHint.java:1666)
        at org.netbeans.modules.java.hints.introduce.IntroduceAction.doPerformAction(IntroduceAction.java:123)
        at org.netbeans.modules.java.hints.introduce.IntroduceAction.perform(IntroduceAction.java:98)
        at org.netbeans.modules.java.hints.infrastructure.HintAction.doPerform(HintAction.java:99)
        at org.netbeans.modules.java.hints.infrastructure.HintAction.actionPerformed(HintAction.java:73)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
        at java.awt.Component.processMouseEvent(Component.java:6263)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6028)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4630)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2475)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)