Fatal error: Uncaught Error: Class "Composer\Installers\BaseInstaller" not found in /var/www/html/extensions/PageForms/vendor/composer/installers/src/Composer/Installers/BitrixInstaller.php:26 Stack trace: #0 {main} thrown in /var/www/html/extensions/PageForms/vendor/composer/installers/src/Composer/Installers/BitrixInstaller.php on line 26