I want you to listen now.

there is no such error string defined in the script!
the script does not call any external script.
it does not "run" or "shell" anything.

the ONLY things that can be wrong is YOUR call or the ERROR you gave us.

now, if you want to know really the fix to this you have 3 choises:
1) if the error you told us is not the correct one, give the correct one.
2) finally let us know how you call it and how you can be sure that it actually executes?
3) don't let us know, just keep wondering by yourself.
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