HELP!!!

java.lang.IllegalStateException: Out of bounds
        at org.netbeans.core.output2.OutputDocument$DO.calc(OutputDocument.java:620)
        at org.netbeans.core.output2.OutputDocument$DO.getOffset(OutputDocument.java:659)
        at javax.swing.text.DefaultCaret$Handler.insertUpdate(DefaultCaret.java:1663)
        at org.netbeans.core.output2.OutputDocument.fireDocumentEvent(OutputDocument.java:386)
        at org.netbeans.core.output2.OutputDocument.access$200(OutputDocument.java:47)
        at org.netbeans.core.output2.OutputDocument$1.run(OutputDocument.java:317)
        at org.openide.util.Mutex.doEvent(Mutex.java:1158)
        at org.openide.util.Mutex.readAccess(Mutex.java:284)
        at org.netbeans.core.output2.OutputDocument.stateChanged(OutputDocument.java:314)
[catch] at org.netbeans.core.output2.AbstractLines.run(AbstractLines.java:193)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)