the proxy for some reason was not staged on the WN
the grid-proxy-info executable was not found (or it was not in the path) on the WN
the which executable is not installed on the WN
Added:
> >
in the case of CREAM configured with the shared file system and the SLURM support enabled, the shared directories may by all owned by the fake user "nobody" and not by the right users.
0.1 Cannot create the job's working directory! [failure reason = ">>> sudoers file: Alias `XYZ' already defined, line ABC <<<"]