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Error 500

(IntegrityError) null value in column "item_manufacturer" violates not-null constraint 

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/CherryPy-2.3.0-py2.5.egg/cherrypy/_cphttptools.py", line 121, in _run
    self.main()
  File "/usr/lib/python2.5/site-packages/CherryPy-2.3.0-py2.5.egg/cherrypy/_cphttptools.py", line 264, in main
    body = page_handler(*virtual_path, **self.params)
  File "<string>", line 3, in addToCart
  File "/usr/lib/python2.5/site-packages/TurboGears-1.1b1-py2.5.egg/turbogears/controllers.py", line 345, in expose
    *args, **kw)
  File "<generated code>", line 0, in run_with_transaction
  File "/usr/lib/python2.5/site-packages/PEAK_Rules-0.5a1.dev_r2582-py2.5.egg/peak/rules/core.py", line 153, in __call__
    return self.body(*args, **kw)
  File "/usr/lib/python2.5/site-packages/TurboGears-1.1b1-py2.5.egg/turbogears/database.py", line 435, in sa_rwt
    session.commit()
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/scoping.py", line 121, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/session.py", line 670, in commit
    self.transaction.commit()
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/session.py", line 375, in commit
    self._prepare_impl()
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/session.py", line 359, in _prepare_impl
    self.session.flush()
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/session.py", line 1354, in flush
    self._flush(objects)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/session.py", line 1424, in _flush
    flush_context.execute()
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/unitofwork.py", line 260, in execute
    UOWExecutor().execute(self, tasks)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/unitofwork.py", line 723, in execute
    self.execute_save_steps(trans, task)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/unitofwork.py", line 738, in execute_save_steps
    self.save_objects(trans, task)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/unitofwork.py", line 729, in save_objects
    task.mapper._save_obj(task.polymorphic_tosave_objects, trans)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/orm/mapper.py", line 1333, in _save_obj
    c = connection.execute(statement.values(value_params), params)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/engine/base.py", line 806, in execute
    return Connection.executors[c](self, object, multiparams, params)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/engine/base.py", line 856, in execute_clauseelement
    return self.__execute_context(context)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/engine/base.py", line 878, in __execute_context
    self._cursor_execute(context.cursor, context.statement, context.parameters[0], context=context)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/engine/base.py", line 927, in _cursor_execute
    self._handle_dbapi_exception(e, statement, parameters, cursor)
  File "/usr/lib/python2.5/site-packages/SQLAlchemy-0.5.0rc4-py2.5.egg/sqlalchemy/engine/base.py", line 909, in _handle_dbapi_exception
    raise exc.DBAPIError.instance(statement, parameters, e, connection_invalidated=is_disconnect)
IntegrityError: ('(IntegrityError) null value in column "item_manufacturer" violates not-null constraint\n', <bound method Root.addToCart of <dollarshops.controllers.Root object at 0x8cf3ecc>>) 'INSERT INTO cartitem (id, item_manufacturer, item_item_code, quantity) VALUES (%(id)s, %(item_manufacturer)s, %(item_item_code)s, %(quantity)s)' {'item_item_code': None, 'item_manufacturer': None, 'id': '709031130e84daedacea4552c8e53093abe5d03c', 'quantity': '1'}