Hi all. How are you?

I'm trying to upgrade my TG version from 1.0.3 to 1.0.8 but give me a
strange error.
I display it below.

===First Error===

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.4/cherrypy/_cphttptools.py", line
119, in _run
    applyFilters('before_main')
  File "/usr/lib/pymodules/python2.4/cherrypy/filters/__init__.py",
line 151, in applyFilters
    method()
  File "/usr/lib/pymodules/python2.4/turbogears/visit/api.py", line
244, in before_main
    plugin.record_request(visit)
  File "/usr/lib/pymodules/python2.4/turbogears/identity/visitor.py",
line 170, in record_request
    identity = self.identity_from_request(visit.key)
  File "/usr/lib/pymodules/python2.4/turbogears/identity/visitor.py",
line 92, in identity_from_request
    identity = source(visit_key)
  File "/usr/lib/pymodules/python2.4/turbogears/identity/visitor.py",
line 151, in identity_from_form
    identity = self.provider.validate_identity(user_name, pw,
visit_key)
  File "/usr/lib/pymodules/python2.4/turbogears/identity/
saprovider.py", line 186, in validate_identity
    user = user_class.query.filter_by(user_name=user_name).first()
AttributeError: 'function' object has no attribute 'filter_by'

Can you explain me why? and how can i resolve it?
thanks
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