Why 404 in GitHub Pages?

Question

GitHub

I have several folders with projects (sites). For each of them, GitHub Pages works correctly (the repository is named accordingly). But now, when I try to go to the next project, it gives out 404 not found. index.html is, the path is correct. Screenshots and links are attached. Help me please.
Repository
404

Answer 1

The answer is on the link with your 404:
https://help.github.com/en/articles/user-organizat...