Can't enter the answer, don't show the problem solution.
1, first of all, you can check whether the network you are connected to can run normally. If there is no message on the page, it is a network problem;
2, or you are out of time in the process of answering questions or missed the answer questions. Once this happens, the questions can't get in;
3. There may be too many users, so you can try it several times.