Additional: For people using Rider in Windows
- Open your “Windows Explorer” (U can’t search inside Rider)
- Go to: UE_5.5\Engine\Source\Programs\AutomationTool
- Right-click on the folder “Mutable”
- Show more options
- Properties
- Uncheck Attributes “Read-only”, apply it in all subfolder
- Save & Re-open Rider
- Now your error gone