[web2py] cannot redefine field

[K. Antonis Tzorvas]

db.define_table('station',
                Field('name'),
                Field('country', 'string'),
                Field('city', 'string'),
                Field('records_file', 'upload'),
                format='%(name)s',
                migrate=False)

db.station.name.requires = IS_NOT_IN_DB(db, 'station.name')

i had this one
and i want to add an extra line
db.station.records_file = IS_NOT_EMPTY()

but i am getting this erro:

> SyntaxError: Object exists and cannot be redefined: records_file
>
>  
any idea?

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