eBay listing error - You entered more pictures than allowed

eBay places a limit on the number of pictures you can add to a particular limit. Currently they allow up to 12. This error occurs when your listing has more than twelve (12) pictures. 

To resolve it, go to the product edit page of your listing and remove some of your pictures leaving at most 12, then save.

Contact support at customer-success@syncommerceapp.com if the problem persists.