To enable debug mode in PrestaShop using PrestaShop admin panel:
- go to Advanced Parameters => Performance
- in Debug Mode section, set the Debug mode to YES
- save the changes
To enable debug mode in Prestashop manually:
- edit the file config/defines.inc.php
- find the following code:
define('_PS_MODE_DEV_', false);
- replace false with true:
define('_PS_MODE_DEV_', true);
- save the changes