Clockwork RevitFaceReference.FromDynamoSurface returns null

While calling RevitFaceReference.FromDynamoSurface node in Dynamo 1.0, it keeps return null.
Anybody know why?

You just created that face from scratch. It does not have a Revit equivalent inside the model. That node works only for faces selected with the built-in “Select Face(s)” node.

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