[SQLObject] Keyword argument error

[Gavin <bra...@ri...>]

With the following code:
    import streamcast

    streamcast.StreamSources(stream_name='Enemy Combatant         
Radio',stream_source='http://radio.indymedia.org:8001/sf-hifi.mp3',start_date='2004-05-09 
23:25:00',end_date='2004-05-09 23:30:00')

I get this error:
    TypeError: __new__() got an unexpected keyword argument 'stream_name'

The StreamSource class:
    class StreamSources(SQLObject.SQLObject):
   
        db = Database()

        _connection = 
SQLObject.MySQLConnection(db=db.name,user=db.user,passwd=db.password)
        _style = SQLObject.Style()
        _table = 'streamcast'
   
        stream_name = SQLObject.StringCol(length=150,notNull=True)
        stream_source = SQLObject.StringCol(length=255,notNull=True)
        start_date = SQLObject.DateTimeCol(notNull=True)
        end_date    = SQLObject.DateTimeCol(notNull=True)
        default_stream = SQLObject.BoolCol()

- Gavin