Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in /var/www/typo3/vendor/typo3/cms-composer-installers/src/Installer/CoreInstaller.php:29 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/typo3/cms-composer-installers/src/Installer/CoreInstaller.php on line 29