It may be a network problem. Please check whether the Internet environment is normal. If not, please try to switch networks. If not, please close the page and restart. It is also possible that the page is not official website, so it is suggested to switch to the real official website, and you should be able to log in and use it normally. If it doesn't work again, it may be the page itself. There are too many users, which caused the jam. This situation should be better if it is repeated. If the above methods can't be handled, you can find a teacher to contact the developer of the software to fix it, and it will be fine soon.