First of all, the continuing education of Erjian suggests that unknown mistakes may be caused by many reasons. We can solve this problem from the following two aspects: 1. Contact the platform customer service for help; 2. Check whether the website and account information of continuing education are correct.

For the first aspect, we can directly contact the customer service of the continuing education platform, explain the specific situation of the problem, ask them for help, and they will handle it.

For the second aspect, we need to check whether our account and the website of continuing education, including account name, password and other information, are correct, try to log in or register again, or try to change other continuing education platforms.

Combining the above two points, this problem should be solved.