A face of a joined (i.e. one cuts another) mass could not be split into interior and exterior faces. Remove the cut to resolve.

public static FailureDefinitionId FaceSplitFailed { get; }

Public Shared ReadOnly Property FaceSplitFailed As FailureDefinitionId
	Get

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