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 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. 
 Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
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FailureDefinitionId See Also
 See Also