"UPC is missing a value. Enter a value and try again." at magento 1.9.2.2

[omar-mahmoud-code]

"UPC is missing a value. Enter a value and try again." at magento 1.9.2.2 with m2epro 4.6
and after i debug the script i found it's send the below array with the data array
[product_details] => Array
(
[upc] => 4008400350400
[mpn] => Does Not Apply
[include_description] => 1
[include_image] => 1
)