"lib/db.php" missing

I'm using InnoDB, and i get this error:

PHP Warning:  require_once(lib/db.php): failed to open stream: No such file or directory in /srv/newznab/misc/update_scripts/nix_scripts/tmux/bin/nzb-import.php on line 4
PHP Fatal error:  require_once(): Failed opening required 'lib/db.php' (include_path='.:/usr/share/php:/usr/share/pear') in /srv/newznab/misc/update_scripts/nix_scripts/tmux/bin/nzb-import.php on line 4

with the path to the InnoDB db.php it seems to work fine