If I am not defining auth the error does not appear, but the grid 
user_signature is not working. I am setting the hmac_key as mentioned in 
model amc.py.
from gluon.storage import Storage
from gluon.utils import web2py_uuid
if not 'auth' in session:
    session.auth = Storage(hmac_key=web2py_uuid()

How can I make grid user_signature to work without auth.

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