1. There is an error in the user name or password, and both the user name and password are wrong. Very easy to solve, just find the right one;
2. The school is not registered. It is more troublesome and may not be admitted;
3. The system error is the problem of the website itself. It is also very easy to solve, as long as the system error is corrected;
4. Computer problems. It is suggested to report the situation to the school office and solve it by the school office. Just repair the computer or replace it with a qualified computer.