Can’t access notebooks stored in skydrive

If I try to access via SkyDrive, I see that they exist in my recent documents, give the file sizes (18mb, 1.4 mb), etc. but when I click on one, it comes up with the following message: "This item might not exist or is no longer available. This item might have been deleted, expired, or you might not have permission to view it. Contact the owner of this item for more information." However, one of the notebooks I have shared with a friend. He is still able to view that notebook, but I can no longer get to it.

If I try to access via the OneNote application, it asks for my password then promptly asks for it again, and again, and again, etc. If I give it a wrong password it tells me that it is wrong.

What can I do to get my notebooks back?

Thanks!