I’m encountering this error a lot these days, I’m not sure why. But for some reason this error only appears when I’m running a workflow that was created using an older version of UiPath. When I try to run the workflow on Studio, it gives me this message:

As suggested by the prompt, I made sure that the UIRobot service is started. But it still doesn’t work. Restarting the service doesn’t work either unless it’s done in the following order (see below). So here’s how I got through this error:

1. Close UiPath Studio
2. Run services.msc (win + R >> services.msc)
3. Look for UiPath Robot service
4. Stop UiPath Robot service (right click >> stop or look for the stop button on the toolbar)
5. Open UiPath Studio and load the workflow you want to run
6. Start UiPath Robot service (right click >> start of look for the start button on the toolbar)7. Run the workflow on UiPath Studio

That should do it! Hopefully it works for you too 🙂