Fatal error: Uncaught Error: Class "Composer\Installer\LibraryInstaller" not found in /home/rankting/public_html/ALT/ranketing.de (contao)/vendor/contao-components/installer/src/Composer/LibraryInstaller.php:16 Stack trace: #0 {main} thrown in /home/rankting/public_html/ALT/ranketing.de (contao)/vendor/contao-components/installer/src/Composer/LibraryInstaller.php on line 16