I lost my online presentation!! Please restore to yesterday's backup!

I was editing the Prezi this morning and got an error about something being too small. When I tried to undo the changes, some items were missing, and then the entire presentation was gone!

Please restore my Prezi to the last backup from 2013-12-04. Here's my link:

http://prezi.com/_nz23-etflwy/edit/

Thanks!