Warning: require_once(db.php): Failed to open stream: No such file or directory in /app/public/index.php on line 3

Fatal error: Uncaught Error: Failed opening required 'db.php' (include_path='.:/usr/local/lib/php') in /app/public/index.php:3 Stack trace: #0 {main} thrown in /app/public/index.php on line 3