bootcamp demo my zombies fall through the terrain

hi.
i am using the bootcamp demo on making a zombie game but there’s a problem
when i add my zombies with the scripts and everything needed and then begin the game. they just fall through the ground also if i place a cube underneath them they also fall through that.
please help

Click on your zombie object and then go to Component>Physics>Character Controller. That should add a character controller to your zombie and might solve your problem. If it doesn’t then we would need more info about your current script for the zombie…