Fatal error: Uncaught Error: Class "Composer\Installers\BaseInstaller" not found in /home/imperfettolab/public_html/web/app/plugins/sitepress-multilingual-cms/vendor/composer/installers/src/Composer/Installers/WHMCSInstaller.php:5 Stack trace: #0 {main} thrown in /home/imperfettolab/public_html/web/app/plugins/sitepress-multilingual-cms/vendor/composer/installers/src/Composer/Installers/WHMCSInstaller.php on line 5