1. The current user's network is very poor. Users are advised to check the network status of their mobile phones.
2. Only when the current health certificate is invalid, the results will not be scanned. If the health certificate is invalid, the user can refresh it again.
3. The current system is out of order, so users are advised to wait for some time before re-operating. It is best to go to the local official website to check the first-hand authoritative information.