1. The user's network is very poor. Users are advised to check the network status of their mobile phones.
2. Only when the health code has expired, there will be unscannable results. If the health code is invalid, the user can refresh it again.
3. The system is out of order, so users are advised to wait for some time before re-operating. Due to the epidemic, people need to scan the health code to locate everyone's location. Health code is a personal two-dimensional code based on actual real data, which is generated by citizens or people who have returned to work on their own online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The promulgation of the Health Law aims to make the resumption of work more accurate, scientific and orderly.