Object reference not set to an instance of an object ERROR

Oct 2, 2010 at 7:34 AM

I more and more often get this error message:

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[10/2/2010 2:31:50 AM] **ERROR** Source: WOSI.NET.inTELIPhone
Message: Object reference not set to an instance of an object.
Stack Trace:

   at WOSI.NET.SIP.TransportLayer.IncomingMessageThread()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

***

Any idea what the cause might be?