subprocess.Popen(): OSError: [Errno 8] Exec format error in python?

Yesterday, I wrote and ran a python script which executes a shell using subprocess.Popen(command.split()) where command is string which constitutes .sh script and its argument. This script was working fine until yesterday. Today, I ran the same script and now I am continuously hitting this error.

File "/usr/lib/python2.7/", line 679, in __init__
errread, errwrite)
File "/usr/lib/python2.7/", line 1249, in _execute_child
raise child_exception
OSError: [Errno 8] Exec format error

I know there are similar questions that have been asked before related to this question, but in my case I tried everything which doesn’t solve my purpose. Using shell=True does not work because my shell script calls an another shell script before which some environment has to be set in order to run that script. I am badly stuck in this. I just restart my system once. I am using ubuntu 12.04


 import subprocess
 import os
 import sys


 shell_command = 'my_path/ ' + arg1 + ' '+ arg2
 P = subprocess.Popen(shell_command.split())


  cd $TOP
  setup the environment and run shell script
  build the kernel ...
  execute shell command .....

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