Enable the error reporting and share the error report.
If you can't access Backoffice then to enable debug mode:
Navigate to config directory and open defines.inc.php file and find the following code:
define('_PS_MODE_DEV_', false);
Edit the code:
define('_PS_MODE_DEV_', true);
.png.022b5452a8f28f552bc9430097a16da2.png)