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AutoCAD Build 3D Risers (Toolbar)
After setting up a fitting in the Parts Tree then trying to Insert Fitting, you get the Unhandled Exception error below
Unknown but seemed to be happening in AutoCAD 2019/2020 and HydraCAD v56
Updating to AutoCAD 2021/2022/2023 and HydraCAD v57 made the command work again