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Revit Based HydraCAD (Ribbon/Toolbar/Location)
Description:
When trying to select Pick Light, this error shows... Sequence contains no elements

The Revit 2026 update caused an issue with classifying lights in HydraCAD for Revit
Watch for an update, and update to version 26.2.008 or higher when it is available.
In the meantime, to successfully use the Spacing and Layout tool, use the Pick 3 Points selection method instead.