1. Incorrect account or password. When you enter your account number and password, you may make mistakes due to mistakes or mistakes. It is recommended to check the account number and password again.

2. The account number or password has been modified or forgotten. If you haven't logged into the platform for a long time, it may be that your account number and password have been modified or forgotten. You can find the password back or contact the platform customer service.

3. The account number or password is stolen. If the account number and password are stolen by others, it may lead to the inability to log in to the platform. This situation needs to be handled by contacting the platform customer service in time.

In addition to the above reasons, there may be network problems or platform system failures. I suggest you try it a few times more. If the problem still exists, you can contact customer service or platform administrator to handle it. At the same time, we should also pay attention to protecting accounts and passwords to avoid leakage and misappropriation.