This morning i tried to open a file that I've been using quite often. When it finally opened i got the message: Could not load an object because it is not available on this machine. I rebooted and retried, and got the same message. So, I e-mailed the file to another machine, and again i got the same message. When i use the file i always save-as and create a back-up. When i tried opening any of the back-up files, they too gave me the same message. I'd really like to know what happened and what to do to fix the issue. PLEASE HELP !