This error happened occasionally in stable 0.8 too, but this time on the 0.8-2054-g0eaaafd experimental version this error also crashs the game, in subsequent new games this error repeats so I can’t play at all. I have to delete the game and re-unzip the downloaded file to play the game again.
I’m on Windows 8.
Edit: Reset the world seems to fix this problem, it’s weird because I already set the ‘Delete world’ option to “Yes” so a world reset shouldn’t be necessary.