java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at java.io.FileOutputStream.(Unknown Source)
at java.io.FileOutputStream.(Unknown Source)
at flex.services.logging.FileLogEventHandler.openFile(FileLogEventHandler.java:333)
at flex.services.logging.FileLogEventHandler.checkForRotation(FileLogEventHandler.java:300)
at flex.services.logging.FileLogEventHandler.logEvent(FileLogEventHandler.java:178)
at flex.services.logging.LogEventHandler.log(LogEventHandler.java:27)
at flex.services.logging.ThreadedLogEventHandler.processNextInQueue(ThreadedLogEventHandler.java:153)
at flex.services.logging.ThreadedLogEventHandler$ProcessQueueTask.run(ThreadedLogEventHandler.java:125)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)

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