Highlighted area based load boundary lines overlap. One of them may be ignored when Revit finds load area boundaries. Delete one of the lines.

public static FailureDefinitionId ELASeparationLinesOverlap { get; }

Public Shared ReadOnly Property ELASeparationLinesOverlap As FailureDefinitionId
	Get

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