Thanks Eitan for your response.

I have ensured that goal is not being set in unknown or somewhere in the
obstacle. 
When i click on rviz the global planner is working properly but from code it
is not.  In both ways global planner is referring same configuration files
of the stack. As i said it is setting a goal but not planning a path to move
on it.

Is there anything i should specifically look for?

Abhy.

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