i tried to save it as pdf an open it in illustator but i get the same message.
I found that when later i tried to place an image (that's also in the 'damaged' file) in another ai file, it gave me the same message, so maybe it might be that image's problem, but it's a simple png so i don't see the problem.

here's the file:
http://www.filedropper.com/onepager04

hope you can help!

thx

B