1. The device may not be connected to the Internet. Make sure that the device is connected to a stable network before trying.
2. The application may need to be updated to the latest version. You can go to the app store or official website to download the latest version.
3. It is also possible that there is something wrong with the application server, which makes it impossible to upgrade. You can try to upgrade later, or contact the customer service support of the application for consultation and help.