UiPath errors / Version
Cannot create unknown type '{http://schemas.uipath.com/workflow/activities}ReadRange'
Cause
The workflow references the ReadRange (or other Excel/Mail/PDF) activity but the corresponding activities package is missing or not deployed on the Robot machine.
Fix
In Studio, open Manage Packages and confirm UiPath.Excel.Activities is installed and current. When publishing, ensure dependent packages are in the Orchestrator NuGet feed or the Robot's local package folder. On the Robot, clear the .nuget cache (C:\Users\<user>\.nuget\packages) to force a fresh download. Re-run.
Part of the Automation Error Index — UiPath errors: browse all.
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