Featured Content Pages Giving 404 Error

I am unable to see any of my featured content pages. The summaries are showing on the landing page (https://CampbellDuke.com) but when you click on the link this is the error: <h1 style="text-align: center;">Sorry, this page doesn't exist. Please check the URL or go back a page.</h1> <h2 style="text-align: center;">404 Error. Page Not Found.</h2> Is there something (hopefully) simple I'm overlooking? Thanks for any help you might have.