When logging in to the smart campus, the user does not exist or the account has expired. In this case, you should see if there is a network problem. If there is no network problem, you can turn off your phone and log in again, or uninstall the smart campus and download it again.
There are several reasons why the information of campus students can't be added. First, the information about students is incorrect. In particular, the information of the ID number is incorrect, which makes the computer unable to authenticate the information. The second is the failure of the computer system. This probability is too low. Third, the information input before and after is inconsistent.