Can not scale the biggest object - "Your last performance can not be performed"

Hey,

I just finished after four hours of working my prezi and wanted to check the last things, then a hidden frame causes a bug and the warning:

"Your last performance can not be performed".

I think it is a hidden frame, which is bigger than the prezi allows. But I can't fix it by myself.

Please, can anybody help me?

This is the link to my prezi:

http://prezi.com/fwwgtf-xkosq/edit/