I'm trying to simulate Kiva with EnergyPlus, but the next error continues to come out.

 ** out.
* Severe  ** Foundation:Kiva="<Default Foundation>", * Foundation:Kiva="", only one floor per Foundation:Kiva Object allowed.

What this is mean? Im quite new in simulation with EnergyPLus and Kiva but i need to calculate the ground surface temperature. Somebody can help me?