http://stackoverflow.com/questions/12134341/sqlalchemy-core-

Traceback (most recent call last):
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1597, in _execute_context
    conn = self.__connection
AttributeError: 'Connection' object has no attribute '_Connection__connection'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1599, in _execute_context
    conn = self._revalidate_connection()
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1023, in _revalidate_connection
    raise exc.ResourceClosedError("This Connection is closed")
sqlalchemy.exc.ResourceClosedError: This Connection is closed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.2/dist-packages/cherrypy/_cprequest.py", line 656, in respond
    response.body = self.handler()
  File "/usr/local/lib/python3.2/dist-packages/cherrypy/lib/encoding.py", line 188, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/local/lib/python3.2/dist-packages/cherrypy/_cpdispatch.py", line 34, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/project/trunk/lib/server.py", line 138, in __call__
    return json.dumps(result, cls = JsonEncoder).encode('utf-8')
  File "/usr/lib/python3.2/json/__init__.py", line 233, in dumps
    **kw).encode(obj)
  File "/usr/lib/python3.2/json/encoder.py", line 188, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python3.2/json/encoder.py", line 246, in iterencode
    return _iterencode(o, 0)
  File "/project/trunk/lib/server.py", line 44, in default
    return obj.jsonencode()
  File "/project/trunk/model/__init__.py", line 324, in jsonencode
    result[attrname] = getattr(self, attrname, None)
  File "/project/trunk/model/__init__.py", line 215, in __getattr__
    result = lazygetter()
  File "/project/trunk/model/sale.py", line 48, in get_description
    return self.load_item('sale.getTags', tagTypeName = 'manufacturer')
  File "/project/trunk/lib/db/__init__.py", line 438, in load_item
    return self.db.invoke(*args, **kwargs).fetchone()[0]
  File "/project/trunk/lib/db/__init__.py", line 216, in invoke
    result = self.conn.execute(query, **kwargs)
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1405, in execute
    params)
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1582, in _execute_text
    statement, parameters
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1605, in _execute_context
    None, None)
  File "/usr/local/lib/python3.2/dist-packages/SQLAlchemy-0.7.5-py3.2.egg/sqlalchemy/engine/base.py", line 1783, in _handle_dbapi_exception
    from e
sqlalchemy.exc.StatementError: This Connection is closed (original cause: sqlalchemy.exc.ResourceClosedError: This Connection is closed) 'select "sale"."getTags"("pTagTypeName" := %(tagTypeName)s);' [{'tagTypeName': 'manufacturer'}]