If you get the following error on startup:
It may be because the game is missing some files that it depends on for playing music and video. The XNA framework uses audio utilities from the Windows Media Player .dlls, which are assumed to be available on every Windows machine.
So, if you don't have it, you can try to install Windows Media Player.
If you don't want to install Windows Media Player, there is a workaround here:http://steamcommunity.com/app/284100/discussions/0/540737414562663604/
This one may appear if XNA didn't find the video codec that it needs to play video.
Try re-installing Windows Media Player to repair the missing codecs.
Try installing "K Lite Codec Pack" or "K Lite Codec Full" to get the codecs from a different source.
If this fails to correct the problem, there is now an option to start the game without video playback (it only affects the main menu):
Find Options.xml (under Documents/Unclaimed World)
Edit the tag "PlayVideo" like so: