Fatal error: Uncaught Error: Class "Jelix\Installer\Module\Installer" not found in /var/www/html/celpa_webgis_13022024/lizmap/vendor/jelix/jcommunity-module/modules/jmessenger/install/install.php:11 Stack trace: #0 {main} thrown in /var/www/html/celpa_webgis_13022024/lizmap/vendor/jelix/jcommunity-module/modules/jmessenger/install/install.php on line 11