@BabyJ Hi, thank you for the reply. I have searched many places online and tried out their suggestions. However, the error persists. I have pressed the "try again" button, disconnected the phone and reconnect again (via cable, and wifi). The project is newly created with the "hello world" ContentView.swift. I really need this features because I start coding for my app on a MacBook Air (dual cores) that I would like to minimize the processing on the device. I think that having the live preview on the real device would relief the MacBook from running a simulator. Moreover, the app that I am building require a camera, which only able to test on a real device. For now, I have to build the app and test on the device. Is this the normal way to do it, or I could "live preview" the app?