I am using Prestashop 1.5.5 and getting above mentioned error while adding new or editing existing product. Site was functioning well until last 2 days but suddenly above message started poping up out of no where when I tried adding new product. I have searched for the solution for whole 3 days but in vein. I have changed forced compile and cache setting as well but made no difference. As suggested in the Prestashop forum, multi-store is disabled, changed define('PS_MODE_DEV', false) to define('PS_MODE_DEV', true), checked browser console using ctl + shift + J, to see if I can find tangible error message, 502 Bad Gateway error in jquery-1.7.2.min.js file ,but couldn't understand reason behind the error. I have attached error message for reference. The site is already up and running. Please help me solve this issue and I'd be really really thankful to you. Just for reference the site is hosted at godaddy.com (shared hosting). Regards