It may be that it is the peak time when you go in, and it may be better after a while. Learning pass is now used in many universities, and many people's cards are normal. The background server can't support it Too many people use this software.

Problems may also occur when rendering data. If you are in a hurry to learn, please close the application and re-enter. You can open it, uninstall it, reinstall it, and then you can't change the network or mobile phone. Click on the task point of the learning course with the computer, and the upload fails, and then click. This is because the network speed is too slow and the configuration is too low.