A common error you may see with the UPC Tool is the 'Token Mismatch Exception"
That message is just one of our many security features designed to help keep you and your data safe.
It usually occurs if you load a page and leave it up for a while. A few things to try that usually resolve the issue:
Simply refresh the page and try again
Log out and log back in
Clear your browser's cache (instructions here http://www.refreshyourcache.com/en/home/)
Try a different browser