Fatal error: Uncaught Exception: Vendor autoload is not found. Please run 'composer install' under application root directory. in /var/www/html/magento/app/autoload.php:46 Stack trace: #0 /var/www/html/magento/app/bootstrap.php(44): require_once() #1 /var/www/html/magento/pub/get.php(20): require('/var/www/html/m...') #2 {main} thrown in /var/www/html/magento/app/autoload.php on line 46