[GRASS-user] problems running v.centroids

[Bartolomei.Chris]

I'm not sure if this is it but looking at the path to the "os.py" my installation (although OSGEO4W and 7.0.4) shows "Lib" not "lib" ...
It it is having trouble finding the os.py file, then the difference in the spelling of lib with a capital letter may be the issue...
Could it be that simple ?!?!
Chris

Chris Bartolomei P.E.
Engineer/Scientist
ENSCO, Inc.
bartolomei.chris at ensco.com
________________________________________
From: grass-user [grass-user-bounces at lists.osgeo.org] On Behalf Of Uwe Fischer [gisfisch at t-online.de]
Sent: Thursday, May 12, 2016 8:48 AM
To: grass-user at lists.osgeo.org
Subject: [GRASS-user] problems running v.centroids

Hello List,

I can’t get >v.centroids< working in Grass 7.0.3.
When I try I get the following message:

v.centroids --overwrite --quiet input=inputmap output=outputmap cat=1000
Traceback (most recent call last):
  File "C:\PROGRA~1\QGISES~1\apps\grass\grass-7.0.3/scripts/v.centroids.py", line 69, in <module> main()
  File "C:\PROGRA~1\QGISES~1\apps\grass\grass-7.0.3/scripts/v.centroids.py", line 63, in main
    grass.exec_command("v.category", type = 'area',**options)
  File "C:\PROGRA~1\QGISES~1\apps\grass\grass-7.0.3\etc\python\grass\script\core.py", line 536, in exec_command
    os.execvpe(prog, args, env)
  File "C:\PROGRA~1\QGISES~1\apps\Python27\lib\os.py", line 353, in execvpe
    _execvpe(file, args, env)
  File "C:\PROGRA~1\QGISES~1\apps\Python27\lib\os.py", line 380, in _execvpe
    func(fullname, *argrest)

OSError: [Errno 2] No such file or directory
(Wed May 11 08:00:49 2016) Command finished (0 sec)

I have no idea what that means and where to look for the error.
Furthermore, the final goal is to run v.centroids as part of an external python script that can be started from outside GRASS.
When I try this, I get the following message:

Process ended with non-zero return code 1. See errors in the (error) output.

What ist the "(error) output" of a python script and where can I find it?

best regards,
Uwe Fischer

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