Fatal error: Uncaught Error: Class "Composer\Installer\LibraryInstaller" not found in /home/cooperativamaism/public_html/staging/vendor/craftcms/plugin-installer/src/Installer.php:21 Stack trace: #0 {main} thrown in /home/cooperativamaism/public_html/staging/vendor/craftcms/plugin-installer/src/Installer.php on line 21