There is an invalid Curtain Panel in the model. This is probably caused by two Grid Lines almost meeting at a border of the Curtain Wall or Sloped Glazing, but not exactly at a point. The Curtain Panel can't be displayed.

public static FailureDefinitionId InvalidCurtainPanelInModel { get; }

Public Shared ReadOnly Property InvalidCurtainPanelInModel As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ InvalidCurtainPanelInModel {
	FailureDefinitionId^ get ();
}