En anglais, votre phrase se traduirait comme suit: "Hello everyone, I'm new to using Opigno LMS. I've completed the installation and created certified courses. However, when the user tries to download their certificate, the following error appears: The website encountered an unexpected error. Please try again later. I am using Opigno 3.1 and drupal 9.5.10 Symfony\Component\Routing\Exception\ResourceNotFoundException: No routes found for "/certificate/group/2/pdf" in Drupal\Core\Routing\Router->matchRequest() (line 124 of core\lib\Drupal\Core\Routing\Router.php)." Could you please help me ?