Getting Exception - object is not ready for user interaction

Hi All,

Sometimes I am getting exception from Silk4NET application as

 Exception Message :
The object is not ready for user interaction because it is not enabled.

 Exception Stack Trace :
   at SilkTest.Ntf.Communicator.SendMessage(Message message, Int32 timeout)
   at SilkTest.Ntf.Agent.SendMessage(Message message)
   at SilkTest.Ntf.Agent.SendMessage(String methodName, Object[] parameters)
   at SilkTest.Ntf.Agent.Invoke(TestObject invokeObject, String methodName, IList parameters)

How to fix this problem? And why this exception occur frequently?

Thank You,

Kishor.