What does null mean? Apple watch.

The application is unavailable, the device is not suitable, and so on.

Application Unavailable: null indicates that an application or function has been deleted or removed in a previous update, making it unavailable. In this case, it is necessary to confirm whether the application or function still exists or whether alternatives are available.

Not applicable to the device: If the "null" screen appears on the Apple Watch, the screen will not be displayed or operated normally due to insufficient power, system failure or software problems. At this time, we need to take corresponding measures to solve the problem, such as charging, restarting the equipment or updating the software.