This error can be caused by many things in PrestaShop. In order to identify the specific issue, PrestaShop needs to be configured to provide error messaging. To do so, please do the following.
- Access your web server and edit the following PrestaShop file: config/defines.inc.php
- Find the line with the following text: define('_PS_MODE_DEV_', false);
-
Change the value to true: define('_PS_MODE_DEV_', true);
- Save the file.
This will allow logging of the PHP error messaging and provide details of the cause of the issue.