java.lang.AssertionError
	at org.netbeans.lib.lexer.TextLexerInputOperation.<init>(TextLexerInputOperation.java:62)
	at org.netbeans.lib.lexer.EmbeddedTokenList.createLexerInputOperation(EmbeddedTokenList.java:289)
	at org.netbeans.lib.lexer.inc.TokenListUpdater.update(TokenListUpdater.java:323)
	at org.netbeans.lib.lexer.TokenHierarchyOperation.addNestedChanges(TokenHierarchyOperation.java:311)
	at org.netbeans.lib.lexer.TokenHierarchyOperation.textModified(TokenHierarchyOperation.java:275)
	at org.netbeans.spi.lexer.TokenHierarchyControl.textModified(TokenHierarchyControl.java:81)
	at org.netbeans.lib.lexer.inc.DocumentInput.modified(DocumentInput.java:117)
	at org.netbeans.lib.lexer.inc.DocumentInput.removeUpdate(DocumentInput.java:108)
	at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.removeUpdate(PriorityDocumentListenerList.java:63)
	at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:242)
	at org.netbeans.editor.BaseDocument.fireRemoveUpdate(BaseDocument.java:1381)
	at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:777)
	at org.netbeans.editor.BaseKit$DeleteCharAction.actionPerformed(BaseKit.java:1425)
	at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:263)
	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1571)
	at javax.swing.JComponent.processKeyBinding(JComponent.java:2763)
	at javax.swing.JComponent.processKeyBindings(JComponent.java:2798)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2726)
	at java.awt.Component.processEvent(Component.java:5265)
	at java.awt.Container.processEvent(Container.java:1966)
	at java.awt.Component.dispatchEventImpl(Component.java:3955)
	at java.awt.Container.dispatchEventImpl(Container.java:2024)
	at java.awt.Component.dispatchEvent(Component.java:3803)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1810)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:672)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:920)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:798)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:636)
	at java.awt.Component.dispatchEventImpl(Component.java:3841)
	at java.awt.Container.dispatchEventImpl(Container.java:2024)
	at java.awt.Window.dispatchEventImpl(Window.java:1774)
	at java.awt.Component.dispatchEvent(Component.java:3803)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)