Internal Error after chaning SITE domain name and modifying html file...?

I'm getting an 500 internal error. I did two things before this happened. (1) I modified a single html file then (2) logged into admin panel and changed the SITE's domain name. Afterward, I restarted the server but the website kept responding w/ 500 error. Here's the apache error log: http://dpaste.org/crfbg/

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