Thread:Extension talk:MobileFrontend/Apache returns 500 error when switching to mobile view

I'm running MW 1.20.4 with a fresh clone of MobileFrontend on a Bitnami LAMP stack. I've installed MobileFrontend and see the "Mobile view" in the footer.

When I click on that "Mobile view", I'm expecting to see the XHTML-rendered version of the Main Page, but I receive an HTTP 500 server error. In error_log, I get the following:

Mon Apr 29 19:24:40.846836 2013] [:error] [pid 2112] [client 68.8.14.91:36270] PHP Fatal error: Call to undefined method OutputPage::getProperty in /opt/bitnami/apps/mediawiki/htdocs/extensions/MobileFrontend/includes/skins/SkinMobile.php on line 195, referer: http://ec2-184-72-9-131.us-west-1.compute.amazonaws.com/mediawiki/index.php/Main_Page

I'm wondering if that method belongs in the Skin, MobileFrontend, or core. It doesn't look like much has been changed recently on the git repository. I'm also wondering if this is environmental to Bitnami or AWS (but that doesn't seem like it would be.)