Fatal error: Uncaught Error: Class 'Composer\Installers\BaseInstaller' not found in /var/www/drupal/sites/energiatalgud/vendor/composer/installers/src/Composer/Installers/OsclassInstaller.php:5 Stack trace: #0 {main} thrown in /var/www/drupal/sites/energiatalgud/vendor/composer/installers/src/Composer/Installers/OsclassInstaller.php on line 5