Background

The page build of Jekyll is quite easy because one doesn’t need to locally generate the HTML code of the Markdown source with rake. One just needs to directly save, commit and push the source code online. The GitHub page support will handle the rest for you.

Problem

I wrote an article in my Jekyll blog yesterday afternoon. From what was shown in the terminal, the page build was smooth as expected. Then, I received a warning from GitHub.

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Solution

The problem can be easily solved: just follow what the email says. I’ve visited this blog article on GitHub to know more about the GitHub Pages upgrade.