If you run into this error: "Can’t get «class mbri» 1 of «class mbar» 1 of «class prcs» "SystemUIServer" of application "System Events" whose description contains "bluetooth". Invalid index.", open up bluetooth settings and check the box that says "Show Bluetooth in menu bar". This fixed the error for me.
If you run into this error: "Can’t get «class mbri» 1 of «class mbar» 1 of «class prcs» "SystemUIServer" of application "System Events" whose description contains "bluetooth". Invalid index.", open up bluetooth settings and check the box that says "Show Bluetooth in menu bar". This fixed the error for me.