i had the same problem.Now solved.
check previous post
http://osdir.com/ml/web2py/2011-08/msg00232.html
2011/8/4 Cliff <cjk...@gmail.com>
> I get an exception from this code in db.py:
>
> auth.settings.extra_fields['auth_user'].append(Field('created_by',
> default=session.auth.user.id), writable=False, readable=False)
>
> Here is the exception:
>
> Traceback (most recent call last):
> File "/media/Myfiles/w2p-1-98-2/web2py/gluon/restricted.py", line
> 192, in restricted
> exec ccode in environment
> File "/media/Myfiles/w2p-1-98-2/web2py/applications/Purchasing/
> models/db.py", line 48, in <module>
> auth.settings.extra_fields['auth_user'].append(Field('created_by',
> KeyError: 'auth_user'
>
> The code is before the call to "define_tables()"
>
> Am I doing something wrong or is this a Web2py problem?
