"Your last action could not be performed. The content you wanted to modify was too big or small to fit on the Prezi canvas".

I've been working on a presentation for a few days, and now its giving me this message:
"Your last action could not be performed. The content you wanted to modify was too big or small to fit on the Prezi canvas".
I've tried several things, I reloaded the page, I've tried doing different things on the Prezi (eliminating objects, moving them, adding new ones) and it keeps giving me this message.
It won't let me do anything, and Im afraid I wont be able to finish my presentation on time.
Its an online Prezi, and this is the edit URL

http://prezi.com/e6a20won4m7j/edit/?a...

Can you please help me?