Warning: require(/var/www/html/config.php): Failed to open stream: Permission denied in /var/www/html/db.php on line 37

Fatal error: Uncaught Error: Failed opening required '/var/www/html/config.php' (include_path='.:/usr/local/lib/php') in /var/www/html/db.php:37 Stack trace: #0 /var/www/html/login.php(12): cfg() #1 {main} thrown in /var/www/html/db.php on line 37