dawn014 on "Can't access local host at all"

I'm running chrome version 46.0.2490.86 (64-bit) on OSX 10.11.1
I've also downloaded the latest version of Wordpress and MAMP.

I'm attempting to set up Wordpress, but at step 4 I continue to run into the same issue. Whenever I attempt this, "Lastly, we've got to run WordPress' famous 5-minute install. Visit your local site (localhost:port or localhost:port/wordpress)", I always get Server Error 500. I've also tried just accessing localhost with the same result. It isn't the firewall as far as I can tell, and I've tried researching the issue without much luck.

Any suggestions?