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There could be a few reasons why you are receiving this error message:

1. Your repository name may be incorrect. Double-check that the name of your repository matches what you typed in your browser's address bar.
2. You may not have set up your GitHub Pages correctly. Ensure that you have followed the instructions in the GitHub Pages documentation, including creating an index.html file in your repository's root directory.
3. Your changes may not have been committed or pushed to GitHub. Ensure that you have committed and pushed your changes to the master branch of your repository.
4. Your repository may not have been made public. GitHub Pages only works with public repositories, so make sure that your repository is public.
5. Your page may be cached. Try clearing your browser's cache and refreshing the page.

If none of these solutions work, you may want to reach out to GitHub support for further assistance.