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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.replace(Unknown Source)	at javax.swing.text.JTextComponent.setText(Unknown Source)	at ronanki.swing.pcahostsimUI$5.itemStateChanged(pcahostsimUI.java:368)	at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)	at javax.swing.JComboBox.selectedItemChanged(Unknown Source)	at javax.swing.JComboBox.setSelectedItem(Unknown Source)	at ronanki.swing.pcahostsimUI$6.textboxlisten(pcahostsimUI.java:398)	at ronanki.swing.pcahostsimUI$6.insertUpdate(pcahostsimUI.java:382)	at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)	at javax.swing.text.AbstractDocument.handleInsertString(Unknown Source)	at javax.swing.text.AbstractDocument.insertString(Unknown Source)	at javax.swing.text.PlainDocument.insertString(Unknown Source)	at javax.swing.text.AbstractDocument.replace(Unknown Source)	at javax.swing.text.JTextComponent.setText(Unknown Source)	at ronanki.swing.pcahostsimUI$5.itemStateChanged(pcahostsimUI.java:368)	at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)	at javax.swing.JComboBox.selectedItemChanged(Unknown Source)	at javax.swing.JComboBox.contentsChanged(Unknown Source)	at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)	at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)	at javax.swing.JComboBox.setSelectedItem(Unknown Source)	at javax.swing.JComboBox.setSelectedIndex(Unknown Source)	at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(Unknown Source)	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at javax.swing.JComponent.processMouseEvent(Unknown Source)	at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(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.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$200(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)