Upgrade from 1.4 to 1.6 won't allow combinations to be saved

[tivicrdotcom]

Hello fellow brothers and sisters, so we did the upgrade, everything was sort of smooth but now when we add a combination it just doesn't happen anything. The page refresshes and we get greeted by the following error message:

Unknown column 'available_date' in 'field list'

INSERT INTO `ps_product_attribute` (`id_product`, `location`, `ean13`, `upc`, `quantity`, `reference`, `supplier_reference`, `wholesale_price`, `price`, `ecotax`, `weight`, `unit_price_impact`, `minimal_quantity`, `default_on`, `available_date`) VALUES ('861', '', '', '', '0', '', '', '0', '0', '0', '0', '0', '1', NULL, '0000-00-00')

 

Anybody with a clue on how to fix it? Thanks in advance!

cheers,
AJ