It seems after setting SUBJECTS_DIR the command succeeded. Some print
message telling what it will do and that it did the job might be reassuring
;-)


On Mon, Apr 1, 2013 at 2:47 AM, Christian Brodbeck <notifications@github.com
> wrote:

> In mne/transforms/coreg.py:
>
> > +                   "create_default_subject().")
> > +            raise ValueError(err)
> > +    if mne_root is None:
> > +        mne_root = get_config('MNE_ROOT', mne_root)
> > +        if mne_root is None:
> > +            err = ("MNE_ROOT environment variable not found. Please "
> > +                   "specify the mne_root parameter in you call to "
> > +                   "create_default_subject().")
> > +            raise ValueError(err)
> > +
> > +    # make sure destination does not already exist
> > +    dest = os.path.join(subjects_dir, 'fsaverage')
> > +    if os.path.exists(dest):
> > +        err = ("Can not create fsaverage because %r already exists in "
> > +               "subjects_dir %r" % ('fsaverage', subjects_dir))
> > +        raise IOError(err)
>
>  If I remove it it will complain that it does not exist ...
>
> only if you remove it from freesurfer's subjects directory
>
> I think it would be great to have one example that works like our examples.
>
> just for create_default_subject? It's just one command :) The only reason
> the error happens is probably because you are using the mne sample dataset
> which already has fsaverage or another subjects_dir which already has
> fsaverage. You can always go with the one you already have, you might just
> not have t
>
> —
> Reply to this email directly or view it on GitHub<https://github.com/mne-tools/mne-python/pull/379/files#r3597599>
> .
>