kindle download error

I got a new iphone 4, now my books in my Kindle app won't download from archive. I get a message "Error, Please remove the book from your device and redownload it from your archived items." I have tried deleting and re-downloading from archive, get the same error. I tried deleting the Kindle app and reinstalling, got the same error. Tried to send it from the Amazon Kindle site to my phone, same error. Anyone have any ideas?