Image of my code.

I'm working on a five page website and just this morning I tried to access a live preview of a file but when I tried it said the command "livePreview.start.preview.atFile" was not found. I'm not sure what's going on, but any suggestions would be greatly appreciated.

I looked up the solution to my problem but I'm new to coding so I don't quite understand what I should do. I've never had this problem before.

I created a new HTML file and c p the existing code into the new file, but nothing happened. It didn't solve the problem. I really didn't expect it to solve my problem, but I really don't know how it happened because it worked just fine yesterday afternoon, so I'm not really sure what's wrong.