Trouble Using Emulator with Bluetooth Extensions

Hello, I am trying to make an app to connect my Arduino with a bluetooth module to this app so I downloaded the latest version of the Bluetooth extension on the extensions site (MIT App Inventor Extensions) but when I drag the bluetooth to my designer screen, I get this error and I'm not sure what to do because I haven't even coded anything related to the Bluetooth yet. I following https://iot.appinventor.mit.edu/assets/tutorials/MIT_App_Inventor_Basic_Connection.pdf exactly and I'd appreciated any help.

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I believe you have to test it with a real device and not with an emulator.

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