Fatal error: Uncaught Error: Class "Composer\Installers\BaseInstaller" not found in /home/tubu/public_html/Drupal_CMS/cms/vendor/composer/installers/src/Composer/Installers/SyDESInstaller.php:5 Stack trace: #0 {main} thrown in /home/tubu/public_html/Drupal_CMS/cms/vendor/composer/installers/src/Composer/Installers/SyDESInstaller.php on line 5