-This issues yould be posted on the topic for that subgame (Carbone NG), also, please read that subgame thread before posting any issue, as it might contain important information (like now).
As stated on the Carbone NG topic, you MUST use a dev version of Minetest. Check on the "Important Information" section on that topic, it says:
Carbone NG wrote:You need a recent Minetest version to play Carbone NG, check out the Builds section of the forum for up-to-date builds.
If you are on windows, try with the builds by Krock or Sfan5.
ALSO! Please don't double post... not even on different boards.