Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Kernel' not found in /var/www/html/app/AppKernel.php:6 Stack trace: #0 /var/www/html/vendor/composer/ClassLoader.php(576): include() #1 /var/www/html/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/var/www/html/v...') #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('AppKernel') #3 /var/www/html/web/app.php(13): spl_autoload_call('AppKernel') #4 /var/www/html/web/app.php(26): run() #5 {main} thrown in /var/www/html/app/AppKernel.php on line 6