4 hours ago, Jaack said:No, my PHP version is 7.1.12 and MySQL is 5.5.41
Check this out -> https://devdocs.prestashop.com/1.7/basics/installation/system-requirements/
It for PS 1.7.6.1 it is recommended PHP 7.2 and MySql 5.6, if your server allows it try to use those versions...
Best Regards