Doubly-curved geometry for Honeybee energy analysis

Hi everyone,

I’m doing an energy analysis in Honeybee for a curved building geometry I created in Rhino.

In Rhino, I can compute the volume of my brep, which I think means it is a closed brep. But when I run the “Honeybee_Export to OpenStudio” component, an error appears saying: “** Severe ** For zone: ZONE_0 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.” Does this error mean my geometry is not closed properly? How do I make it work?

Thank you in advance for your kind help!