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java.lang.IllegalStateException: Attempt to mutate in notification	at javax.swing.text.AbstractDocument.writeLock(Unknown Source)	at javax.swing.text.AbstractDocument.insertString(Unknown Source)	at Cheat3$MyDocumentListener.insertUpdate(Cheat3.java:213)	at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)	at javax.swing.text.AbstractDocument.insertString(Unknown Source)	at javax.swing.text.JTextComponent.replaceSelection(Unknown Source)	at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(Unknown Source)	at javax.swing.SwingUtilities.notifyAction(Unknown Source)	at javax.swing.JComponent.processKeyBinding(Unknown Source)	at javax.swing.JComponent.processKeyBindings(Unknown Source)	at javax.swing.JComponent.processKeyEvent(Unknown Source)	at javax.swing.JTextArea.processKeyEvent(Unknown Source)	at javax.swing.text.JTextComponent.replaceInputMethodText(Unknown Source)	at javax.swing.text.JTextComponent.processInputMethodEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)