### Severe errors in OS about thermal zones' volume and Coil:Cooling:DX:VariableRefrigerantFlow

** Severe ** For zone: MAIN HOTEL - TH.Z. 8 it is not possible to
calculate the volume from the
surrounding surfaces so either
provide the volume value or define
all the surfaces to fully enclose the
zone.

** Severe ** For zone: ROOMS - TH.Z. 13 it is not possible to calculate
the volume from the surrounding
surfaces so either provide the volume
value or define all the surfaces to
fully enclose the zone.

** Severe ** Coil:Cooling:DX:VariableRefrigerantFlow
"VRF ZONE TERMINAL COOLING COIL 48"

As it concerns the first two errrors, i think i have to measure the volume of those thermal zones and insert it in Sketchup but I don't know exactly how, except by measuring length,width and height, which it's not easy at all with my building so I was thinking if there is another way to do it.
About the last error I don't have a clue what to do