Just got error code 13-18 and will not print

I loaded in the latest bios for the Artisan last night (showed up in my Artisan display to be done). Now when I try to print something I am getting an Error code: 13-18 which is a clogged or pushed up nozzle. Both nozzles work just fine in loading and unloading filament but that is as far as I can get due to the error code. I am out of business until i can get the error code corrected.
Any idea what the issue may be and how to correct/ Is this a bug with the new update?? If so, how can I load in the old update or fix the issue.

If you already checked what it suggests, and it looks good, try Support Ticket Form