In what kind of condition, Rhino.Geometry.Vector3d.VectorAngle return -1.23432101234321E+308?

@Katsuya_Obara wrote:

I have knowledge on Python but zero on .NET.
When I tried to run the energy simulation by Honeybee, I got the error.
And investigating the reason, I found that Rhino.Geometry.Vector3d.VectorAngle is returning -1.23432101234321E+308 because the condition match to if (!a.Unitize() || !b.Unitize()) .
Can anyone tell me what this condition means?
I also attach the link to source code of VectorAngle.

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