The files seems to be correct. Mine looks the same. Please try to reboot teh server and get the latest version like this:
as you requested, I got the lastest version and reboot the tech server. but it failed again. see below pictures.
finally it worked with Google Chome. Thank you guys for the help!
@Jonson.Liu
How did you solve it? in case we have another student with a similar problem
He solved it by changing the browser to google chrome.
sorry for late reply, I tried all steps you guys suggested and finally worked with Google Chrome. but it doesn’t work with Microsoft Edge all the time.