hi, you made a typo:

as you can see you added an extra space in .html. So remove it. Here is the correct file name: index.html. Anyways, the default file that the web browser runs is index.html, so you could just use a link to have people go to the room1 html.

What exactly is the problem?

There is a space between index and the . it should be index.html but it is index .html