Werkzeug Internal Server Error

traceback.txt

Traceback (most recent call last):
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 2000, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1991, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1567, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1988, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1641, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1544, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1639, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask/app.py", line 1625, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/flask_login.py", line 792, in decorated_view
    return func(*args, **kwargs)
  File "/Users/bob/python/jcm_matchmaker/app/decorators.py", line 12, in decorated_function
    return f(*args, **kwargs)
  File "/Users/bob/python/jcm_matchmaker/app/main/views.py", line 198, in manage_companies
    company.countries = form.countries.data
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 224, in __set__
    instance_dict(instance), value, None)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/sqlalchemy/orm/dynamic.py", line 139, in set
    self._set_iterable(state, dict_, value)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/sqlalchemy/orm/dynamic.py", line 161, in _set_iterable
    collection_history=collection_history)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/sqlalchemy/orm/dynamic.py", line 99, in fire_append_event
    value = fn(state, value, initiator or self._append_token)
  File "/Users/bob/python/jcm_matchmaker/venv/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 1176, in emit_backref_from_collection_append_event
    child_state, child_dict = instance_state(child), \
AttributeError: 'int' object has no attribute '_sa_instance_state'