Warning: include(db.php): failed to open stream: No such file or directory in /app/index.php on line 59

Warning: include(db.php): failed to open stream: No such file or directory in /app/index.php on line 59

Warning: include(): Failed opening 'db.php' for inclusion (include_path='.:/usr/local/lib/php') in /app/index.php on line 59

Fatal error: Class 'db' not found in /app/index.php on line 66