python error using an executable with Z shell

Question

I'm getting this error from the Unix Z shell (I'm on Mac):

python: posix_spawn: /System/Library/Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/MacOS/Python: No such file or directory

What am I doing? I'm just running a software in which I put my executable python script. My script is working without any issue, I can also run it from the shell by itself and still works.

I have to mention I'm using Python 2.7, even when I launch Python from the shell it starts with Python 2.7 and not the Version2.6. I actually tried to remove Python 2.6 from the Frameworks but again the same error.

Putting python2.7 sreloc.py as a line (instead of just sreloc.py) for example (this is a piece of the big code where my script lies):

do
   $inv
   python2.7 sreloc.py
   $fmm>$diagnos
   cp $ttim $mtrav

the error I'm getting is:

/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python: can't open file 'sreloc.py': [Errno 2] No such file or directory

I'm really interested in solving this last problem, or anyway being able to run sreloc.py as a part of the main code, but any idea about the first one would be appreciated.

Cheers