sql error during upgrade

[lovemyseo]

O ps_DEv_mode true and enable php erros while upgrading from PS 1,4.10 to 1,5.4,1

SQL 1.5.0.10 1242 in INSERT INTO `ps_product_attribute_shop` (`id_product_attribute`, `id_shop`, `wholesale_price`, `price`, `ecotax`, `weight`, `unit_price_impact`, `default_on`, `minimal_quantity`, `available_date`) (SELECT `id_product_attribute`, (SELECT `value` FROM `ps_configuration` WHERE `name` = 'PS_SHOP_DEFAULT'), `wholesale_price`, `price`, `ecotax`, `weight`, `unit_price_impact`, `default_on`, `minimal_quantity`, `available_date` FROM `ps_product_attribute`): Subquery returns more than 1 row

 

[ERROR] PHP 1.5.0.13 -- Step 3: Fill in id_order_reference and merge duplicate lines /* PHP:add_order_reference_in_order_payment(); */

 

Warning detected during upgrade. 

What is this error 

 

?