My Wiki plugin stopped working!

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My Wiki plugin was working fine earlier, but then I installed Dustin's Google Calendar plugin (http://www.projectpier.org/node/2734). I played around with it a bit, but discovered it wasn't right for me, so I deactivated the Calendar plugin. Then my Wiki completely stopped working.

As soon as I click the Wiki tab, I'm confronted with:

body { font-family: Arial; font-size:12pt; margin: 0 5px; padding: 1px; }
Sorry, fatal error happened
Please explain what you were doing:

Error:
Class 'Revision' not found
File:
/home/lnelson/team.ferdinandcc.org/application/plugins/wiki/models/WikiPage.class.php
Line:
208
Release:
pp086beta2
PHP version:
5.2.17
Table prefix:
PP086_
Request:
/index.php?c=wiki&a=index&active_project=2&1321039182&trace
Browser:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/534.51.22 (KHTML, like Gecko) Version/5.1.1 Safari/534.51.22

Try deleting cache/autoloader.php

Hooray! That worked perfectly, thank you.

Oh, great, you're welcome!