Hi @lujiaxing2007,
Revit Unconnected Height valid values range is [0.1, 3000] feet.
In your case that your Rhino model is in mm. Grasshopper is also working in mm. so you are requesting a 10 mm. wall which is less than 0.1 feet.
We need to add some validation to this component inputs and turn it red in this case.
Thanks for reporting.
thank u yes yes
I think i find the problem,my revit unit is mm, while i thought is m,
thank u very much