service executes fine when I call the first time. However, if I again call the service during second-time service execute successfully followed by this error.
success: True
Unhandled exception in thread started by
sys.excepthook is missing
lost sys.stderr
Hi @vasank1958,
It’s possible that your service server code is not exiting properly. Could you check that you are closing the service call properly, as shown in the example?
One more thing: can you call the service the third time?
yes sir i can keep calling n number of times . however one peculiar thing i noticed is that this error occurs only when i reset the simulation after every service call. if i dont reset the simulation and keep calling the service it works fine 
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Huh, that could probably happen because the reset is confusing the program in some way because the position of the robot suddenly changes. Are you resetting in the middle of a call?
What I would recommend in this case is that you ensure that, if not already, the robot has a clean exit once it has finished a call. Such ‘clean exit’ might be that you stop the robot and any publisher publishing into it so that it would have a clean start at the next call.