Help!! Error when trying to save Keynote presentation…

I'm working on a slide show in Keynote and when I click Save, this message comes up:
______________________
| Save
| Couldn't save document.
|
|________________[_OK_]_


So how do I save my slide show? If I select all the slides and hit copy, then restart Keynote, can I open a new presentation and just paste them? Or will they erase from the clipboard if I quit Keynote?
Any help is appreciated, thanks.

you cant copy and paste slides after quitting keynote. are you sure you have enough space on your hd to save it? also, check your images and anything else you use, a corrupt file could be causing the problem.