Fatal error: Uncaught Error: Class "Magento\Framework\Component\ComponentRegistrar" not found in /var/www/html/magento2/vendor/magento/framework/registration.php:9 Stack trace: #0 /var/www/html/magento2/vendor/composer/autoload_real.php(41): require() #1 /var/www/html/magento2/vendor/composer/autoload_real.php(45): {closure}() #2 /var/www/html/magento2/vendor/autoload.php(25): ComposerAutoloaderInitc96ecaacf3719b75b13057a42d56b271::getLoader() #3 /var/www/html/magento2/app/autoload.php(51): include('...') #4 /var/www/html/magento2/app/bootstrap.php(44): require_once('...') #5 /var/www/html/magento2/pub/index.php(16): require('...') #6 {main} thrown in /var/www/html/magento2/vendor/magento/framework/registration.php on line 9