I'm very sorry to tell you this but I made a mistake about 2 hours ago and published a faulty update for ManiaControl.
Servers that have automatically updated to that version probably don't start anymore.

It's easy to fix and doesn't have any future consequences.
You only need to replace the files of your installation.
For that you can use the current download from the website:
http://maniacontrol.com/download
(Just extract its content into your mc directory.)
Please don't blame ManiaControl, it's my fault and I take the full blame.
So you're free to post your insults here!

Sorry and best regards,
Steff
P.s. If you want to know the exact issue:
We've moved a folder of the installation but the automated build didn't include the new location, so the mc coding tries to load stuff from a location that doesn't exist. It was my fault to perform a new build without adjusting the build code.