1. Incorrect user name or password: Please make sure that the user name and password you entered are correct. Be case-sensitive to ensure that there are no extra spaces. If you are not sure of the user name or password, you can try to reset the password through the "Retrieve Password" or "Forgot Password" options.
2. Network connection problem: Make sure your network connection is normal. You can try to open other websites to confirm whether your network connection is stable. If it is a network problem, you can try to reconnect to the network or contact your network service provider for help.
3. Server problems: Dali Education official website may be maintaining or encountering server problems. At this point, you can try to refresh the page or try to log in later.
4. Browser problems: Sometimes, specific browser settings may cause login problems. You can try logging in in another browser. If you can log in successfully in other browsers, your current browser settings or plug-ins may be causing the problem. Try clearing the browser cache and Cookie, or disable the browser plug-in and try logging in again.
If you still can't solve the problem by trying the above methods, I suggest you contact Dali Education Customer Service Department directly, and they will provide further help and support.