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Revit Based Add-Ins (Ribbon/Toolbar/Location)
Description:
Revit could not complete the external command... Revit encountered a Attempt to modify the model outside of transaction
Corrupt AutoCAD Drawing and / or a bad AutoCAD Template
Put drawing in a new template and Export using the HydraCAD Revit link from the new template.
If this doesn't fix your issue, please contact support for further help at Support@HydraCAD.com