Going to the main TheoryTab page gives 500 error

Currently (4/18/16), going to http://www.hooktheory.com/theorytab gives a 500 error, but the tab name is 404 - Hooktheory. Additionally, the “Never Gonna Give you Up” tab does not show on this page.

I am also experiencing this problem. All other Hooktheory pages seem to work though.

It seems to be fixed.