Home page not found

I have had the home page configured in the system.yaml file and it worked perfect for quite a while. Then all of the sudden it stopped showing the page I had set up for my home page and began showing this error page:

Error 404

Woops. Looks like this page doesn’t exist.

Here’s the section in system.yaml:

alias: ‘/About/about-my-life’
hide_in_urls: false

I haven’t changed anything and I still get the above error message. How can I fix this?