Page Not Found

I created a post and inserted a gallery into the post without any problem. However, when I visit the site and click on one of the photos, I receive a message saying Page Not Found. I figured that I did something wrong and therefore I deleted the entire post and started over from scratch, however, the same thing occurs. This does not happen on any of the other posts.

My site is https://www.focusedonimages.com
The post that is giving me problems is “People”

I am a novice at this and am at a lost – somebody hellllllllp ??