User blog:Therealmisterderp/Why is it not valid?

http://images.akamai.steamusercontent.com/ugc/438322288482387043/086BD23AC56C08B96B253FCADDF4790C956237AE/ What am I doing wrong? I put spooky wood paneling EVERYWHERE, put a table, chair, light sources, and everything else needed to make a house, but the game does not see it as a house, but instead an invalid housing object. The "bleep" is wrong with this game?