Air Bag Idiot Light

So I installed a new stereo last night and everything seemed fine. When I got in the truck this morning the Supplemental Airbag warning light started flashing and hasn't stoped. When I got into work I checked to make sure I didn't have any loose connections, but everything seems OK.

Any ideas? Any way to clear the code to see if maybe it was from a loose connection? Should I remove the stereo before I bring it into Nissan? I've had the truck for exactley 1 week and I'm not in a good mood right now. Thanks for any help...