Fatal error: Uncaught RuntimeException: Unable to write in the "cache" directory (/var/www/html/var/cache/dev). in /var/www/html/vendor/symfony/http-kernel/Kernel.php:643 Stack trace: #0 /var/www/html/vendor/symfony/http-kernel/Kernel.php(534): Symfony\Component\HttpKernel\Kernel->buildContainer() #1 /var/www/html/vendor/symfony/http-kernel/Kernel.php(805): Symfony\Component\HttpKernel\Kernel->initializeContainer() #2 /var/www/html/vendor/symfony/http-kernel/Kernel.php(199): Symfony\Component\HttpKernel\Kernel->preBoot() #3 /var/www/html/public/index.php(13): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #4 {main} thrown in /var/www/html/vendor/symfony/http-kernel/Kernel.php on line 643