Fatal error: Uncaught Error: Class "Composer\Installers\BaseInstaller" not found in /var/www/html/ihp.stage-ci.design/vendor/oomphinc/composer-installers-extender/src/Installers/CustomInstaller.php:16 Stack trace: #0 {main} thrown in /var/www/html/ihp.stage-ci.design/vendor/oomphinc/composer-installers-extender/src/Installers/CustomInstaller.php on line 16