Help w/ Unknown “Fatal Error:” K2 Theme

I went to my site yesterday for the first time in a few days to make a post and I have this error on the main page. It’s not happening on any other page and I have no idea what the problem is. I deactivated all of my plug-ins (I only had three running), but disabling them didn’t help. The only thing I did before going to my site, after starting up my computer, was to clear my cache. I’m using K2 with very few modifications (mainly cosmetic).

Can somebody help me out?

http://www.thepsychicpilot.com/