Adjacent slope-defining lines must have identical eave heights; the highlighted lines do not. You can use the Align Eaves tool to have the eaves aligned for you.

public static FailureDefinitionId DifferentOffsets { get; }

Public Shared ReadOnly Property DifferentOffsets As FailureDefinitionId
	Get

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