Fatal error: Uncaught Error: Class "Composer\Installer\LibraryInstaller" not found in /home/tusaisqu/new/vendor_old/getkirby/composer-installer/src/ComposerInstaller/Installer.php:18 Stack trace: #0 {main} thrown in /home/tusaisqu/new/vendor_old/getkirby/composer-installer/src/ComposerInstaller/Installer.php on line 18