1. The mobile phone system and software conflict with each other, which makes it impossible to log in. The solution is to uninstall the software and then download it again in the app store.

2. Too much data cached by the mobile phone affects the network speed, and the software cannot log in. The solution is to enter the personal phone settings, try to clear the cached data and log in again.

3. The network connection status is not good. The solution is to find an area with good network signal and log in again.