[Reef Man]

Good day,
I need help to take out an error that I am getting.

I installed this mod It was working great, but after upgrade vbulletin, it stop working, so I uninstalled, but after that, everytime I post a new topic, I am getting this error:

Fatal error: require_once() [function.require]: Failed opening required 'bitly.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/reefman/public_html/newthread.php(279) : eval()'d code on line 12

Can you help me to Id what is causing it as the mod was totally uninstalled?
I followed the instructions from the author to uninstall.
I touched vb support but the answer was "We do not help with modifications via the ticket support. "
We disable all the mods by the config.php, including this line:

<?php
define('DISABLE_HOOKS', true);

Then the error stoped.
I already saw someone else here has the same problem and I want to know how do you solve it as this is the only mod installed in my forum that uses bit.ly.

Thanks in advance.