I got the same error. I have added
define('TABLE_ADMINISTRATORS', 'administrators');
to catalog/admin/includes/database_tables.php. It worked.
Now, I'm getting the following error when adding a new product.
1366 - Incorrect integer value: '' for column 'products_ship_methods_id' at row 1
insert into products_shipping (products_ship_zip, products_ship_methods_id, products_ship_price, products_ship_price_two, products_id) values ('600001', '', '10', '1', '7')
[TEP STOP]
How to fix this ??? Please help me.