On Virtual Villagers, Most of my villagers(50-90) sit there "Worried about Housing) were do they build a new 1

PLease help me. My villagers on Virtual Villagers DO NOT no what to do. I am totally completed with it, I beat the game. So i just bought the lvl 3 in construction and now they are "worried about housing" and i can't figure out about were to put my villagers to build it, i cant figure out where the next building is suppost to be. PLEASE HELP ME SOME1!!!!!!!!!!!!!!!!!!!!!!