Discover how to counter the white page of PrestaShop
Often you simply use your Prestashop site and after theinstallation of a new module or a hazardous maniputlation you end up with a page of all white backoffice or that is no longer appear the list of your modules.
Worse, your website in front ends up with a right under the left column or a footer to subscribers absent.
To finally know the truth about the little gremlins in your shop you simply activate the Prestashop error messages.

PrestaShop 1.4 and before
- Use your usual FTP client to your hosting server /config/config.inc.php file
- In this file go to it the optiondisplay_errors
replaces @ini_set ('display_errors', 'off');
by @ini_set('display_errors', 'on'). - Save your file on your server
- Refresh the page in your site in order to highlight the error message
- If you don't understand the error message then head over to the official Prestashop forum to ask for help.
PrestaShop 1.5, PrestaShop 1.6
- Use your usual FTP client to your hosting server /config/defines.inc.php file
- In this file go to it the optiondisplay_errors
replaces define('_PS_MODE_DEV_', false);
by define('_PS_MODE_DEV_', true); - Save your file on your server
- Refresh the page in your site in order to highlight the error message
- If you don't understand the error message then head over to the official Prestashop forum to ask for help.
PrestaShop 1.7
from the backoffice:
- Log on to your backoffice
- Go to the page Advanced Parameters > Performance
- Activate the Debug mode in the Debug section

- Save this configuration
- Remember to disable Debug mode after making your changes
If you don't have access to the backoffice :
- Use your usual FTP client to open your /config/defines.inc.php file on your web hosting server.
- In this file, set the display_errors option to ON.
replaces define('_PS_MODE_DEV_', false);
with define('_PS_MODE_DEV_', true); - Save your file on your server
- Refresh the page of your site to highlight the error message.
- If you don't understand the error message then go to the official Prestashop forum to ask for help.
PrestaShop Cloud
- Use your usual FTP client to your hosting server /.htacess file
- put the HTTP_PS_MODE_DEV_ constant to true
- Save your file on your server
- Refresh the page in your site in order to highlight the error message
- If you don't understand the error message then head over to the official Prestashop forum to ask for help.