If that does not work or the phone is not on, then I recommend mentally and physically retracing your steps until you find your phone. I called it rang but no one answer. Phone model:

Apple Music Converter. Generally, if this error message shows up for the first time, you can try rebooting your Android device, and then check if this error still happens.

If you don't know how to do it, you can go to learn the detailed steps on enabling USB debugging on Android devices. Why Choose U.