This error usually means your GitHub Pages site isn't set up correctly. Verify the repository structure and ensure the branch is published in Pages settings.

A '404 - Page not found' error on GitHub Pages often indicates issues with the repository’s setup or publishing settings. To resolve this, check that the repository contains the necessary files in the correct branch, typically main or gh-pages. Ensure that your HTML or other static site files are placed in the root directory, as Pages won’t work with files in nested directories. Next, go to Settings > Pages in your repository, select the correct branch under 'Source,' and save the configuration. It may take a few minutes for GitHub Pages to build and publish your site. If the issue persists, inspect the repository’s file structure and paths to confirm they are correct. Caching issues can also cause a delay in updates, so try refreshing the page or clearing your browser’s cache.