Fatal error: Uncaught Error: Class "Composer\Installers\BaseInstaller" not found in /home/yukonw3d10w3crea/public_html/vendor/composer/installers/src/Composer/Installers/TYPO3CmsInstaller.php:11 Stack trace: #0 {main} thrown in /home/yukonw3d10w3crea/public_html/vendor/composer/installers/src/Composer/Installers/TYPO3CmsInstaller.php on line 11