Error in Geometry: Attempted to divide by zero

I have been trying to run an air flow simulation through butterfly. Ran into a lot of errors mainly regarding the location of probes. after going through a lot of discussion regarding this, I realized i have to subtract the geometry from the test surface…like discussed here:

After creating a new surface,(see below) i tried generating points to create probes. But Im getting the error as below

Earlier I had just a base surface (see below), but the test points were going through my building geometry (which gives the wrong output obviously)

I’m new to the software, might be an easy fix. It would be helpful if you can tell me what’s wrong here. maybe something in the surface I created ?

Attaching the GH file here:
Outdoor (964.9 KB)