I can't save my document? Error 2!? HELP!!

I have this document I have been working on for a long time. It's a questionnaire and it's packed with images, text boxes and what not..

Suddenly after moving some elements around and editing some text I CANNOT SAVE!

When I try to save I get this message:

"The operation couldn’t be completed. (com.apple.iWork.TSPersistence error 2.)"

What does it mean? Can I fix it? HELP! :-(

It will take me too man hours(or days) copy/pasting all my different elements, text, shapes and images into another document, so any other advices is very very welcome!