It may be a certain module or plugin creating the error. I would suggest re-installing the Prestashop core files for those who haven’t already. That is also for stability motives, in order to’t make use of the name admin like a Listing folder title. You can use every other name https://bookmarks4seo.com/story21023933/how-prestashop-documentation-can-save-you-time-stress-and-money