I can't save my illustrator file?

Hey there,

I really hope some of you out there can help me!

I have been drawing a fashion collection in illustrator. The file that all the styles are in, I can save. But when i open a new document, to put some of the files in there, it won't save. It doesn't tell me why, it just won't save.

I have tried to save on different places, and as both an pdf files and an illustrator file, but it still won't save.

Even if I make a copy of the file with all the styles in it, and delete some of the styles, it won't save? I think I have tried everything.

Anyone out there, who have an idea? I'm desperate! I have an exam in a week..

I'm working on a Mac