[SOLVED] Pages all go to a 500 error...

I'm creating pages on my blog which I do all the time with my other blogs (all with Atahualpa, thank you!)

For some reason, the pages won't load, not from the link on the home page and not even from the "Preview" link on the page creation page.

http://www.kyfood.org

Here's a page: http://www.kyfood.org/about/ (doesn't load with the final slash or without it)

What have I done? I've looked in my theme options and can't figure out what I've done so the pages don't load.

Can you help me figure this out?

Thank you!