между этими строками есть строка if (!defined('_PS_MODE_DEV_'))
показало, на что ругается:
Fatal error: Uncaught Error: Access to undeclared static property: Validate::$values in /home/user2043905/www/onestep.by/classes/controller/AdminController.php:1167 Stack trace: #0 /home/user2043905/www/onestep.by/classes/controller/AdminController.php(713
AdminControllerCore->processUpdateOptions() #1 /home/user2043905/www/onestep.by/classes/controller/Controller.php(171
AdminControllerCore->postProcess() #2 /home/user2043905/www/onestep.by/override/classes/controller/Controller.php(35
ControllerCore->run() #3 /home/user2043905/www/onestep.by/classes/Dispatcher.php(373
Controller->run() #4 /home/user2043905/www/onestep.by/admin5441/index.php(54
DispatcherCore->dispatch() #5 {main} thrown in
/home/user2043905/www/onestep.by/classes/controller/AdminController.php on line
1167