Why is this JQuery Mobile web page blank?

This JQuery Mobile page is similar to other pages I've created which show up fine. This is the page in开发者_运维百科 question:

http://moboscope.appspot.com/x/http://slashdot.org/

When I look at the source of the page, it appears to be correct, its just being rendered as a blank page, at least when I test it in Chrome on a Mac.

Can anyone see what is wrong here?

Look in the browser's JS console:

Uncaught ReferenceError: dfp_tile is not defined

in 2 different document.write() calls.