No Objects Parallel to Ground Plan Error

All valid geometries within the file must have a distinguishable "Floor". This is the bottom facing surface that is less than 1/6 incline. This is to tell the difference between what is acceptable as floor area, such as ramps, and be able to distinguish them from other design elements such as slanted walls. If your Rhino model somehow only consists of geometries that have floors that are steeper than that, we cannot process it properly.