1. User account entered incorrectly.
2. There is an error in the user password input.
3. The platform background server is being maintained or upgraded.
4. The browser is not compatible.
Solution:
Re-check the correctness of the account and enter the login again.
Check the correctness of password input again, and enter login again.
The server upgrade problem requires users to log in again after the formal upgrade, which takes about 6- 12 hours.
For other browsers to log in, it is best to use the latest IE browser, which has strong compatibility.