Fatal error: Uncaught Error: Class "Composer\Installers\BaseInstaller" not found in /home/backend/public_html/fm360/system/vendor/composer/installers/src/Composer/Installers/ExpressionEngineInstaller.php:7 Stack trace: #0 {main} thrown in /home/backend/public_html/fm360/system/vendor/composer/installers/src/Composer/Installers/ExpressionEngineInstaller.php on line 7