Warning: require_once(db/db.php): Failed to open stream: No such file or directory in /home/apache/www/index.php on line 4

Fatal error: Uncaught Error: Failed opening required 'db/db.php' (include_path='.:/usr/share/pear:/usr/share/php') in /home/apache/www/index.php:4 Stack trace: #0 {main} thrown in /home/apache/www/index.php on line 4