Hi @rayhangampong4, thanks for the post and sorry to hear that you are having difficulty with SketchUp for Schools. I am happy to work with you to help get your error solved.
From the look of the link you sent, it seems you are using Microsoft. Of course, if that is incorrect please feel free to correct me. I sent the servers a test signal and it responded to me correctly so it looks like the error is most likely something on your end. To narrow down the cause, I will need more information from you.
When you have a moment, please open developer mode in your browser of choice, access the app and try to sign in. Once you get an error message or other abnormal result, please take a screenshot of the console tab in the developer mode section and post it here. That will help me narrow down potential issues.
Also, can you confirm if you had access to the app before or if this is the first time you are trying to access it? This will further help narrow down potential issues.
Hi again @rayhangampong4. CaseyG from the SketchUp team here. I just wanted to see if you are still having issues logging in to the app or not. Can you please let me know if you are still in need of help?
