Ramp Run has complex boundary and may produce unreasonable geometry. Split it into few Runs by inserting Riser Lines at the end of each Run and at the beginning of the next one. If you want to create Ramp with arc an straight section you can do it using a Run tool.

public static FailureDefinitionId RampRunTooComplex { get; }

Public Shared ReadOnly Property RampRunTooComplex As FailureDefinitionId
	Get

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