I don't know. However, when I tried to see the page as PDF, Adobe Reader said that there's an error on the page and to contact, well, you .

There's a chance that the versions don't match. You've got MW 1.13 and the extension is for 1.14. Since there are no older versions readily available (as there are for MW SVN hosted extensions), you may need to upgrade the wiki to 1.14. That isn't as hard or risky as it might seem to some as long as you follow the instructions.