Dear Fabien and Sebastien,
Thanks a ton for all your patience and help. The problem indeed lies with the way the submission script has been configured.
I am having python script inside the shell script. As of now we have come up with kind of round about way for submitting the simulation in a successful manner.
Nevertheless, I wanted to thank you, when things don't work it can be very frustrating and educational at the same time.
Have a good day.
Regards,
Sumit