perhaps it related with dal constractor on email_id field :
Field('email_id', required = True, unique = True, requires = 
[IS_NOT_IN_DB(db, 'antenna_details.email_id'), IS_EMAIL(), IS_NOT_EMPTY() ] 
)
or you can make simplified it into :
Field('email_id', required = True, unique = True, requires = IS_EMAIL() )

best regards,
stifan

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