"There isn't a GitHub Pages site here."

I have created a repository on GitHub and then give the master branch as a source to GitHub pages. But when I open the link provided by GitHub it says “there isn’t a GitHub pages site here”.
Link to repository:https://github.com/Hassanraja447/layout-bootstrap
Link to page:https://hassanraja447.github.io/layout-bootstrap/

I’m able to see the page. Maybe refresh your browser.