How can I remove a text from a page?

Hello, I am having trouble with one of the pages on my domain called Gallery. If you scroll to the bottom of the gallery page, you will find the text:

"No Results Found

The page you requested could not be found. Try refining your search, or use the navigation above to locate the post."

I removed it from all the other pages by putting them on the default template. However, it would not disappear on this one particular page for some reason.

Any help you may give me would be most appreciated. I did grant temporary access to the site for support staff if needed.

Thank you,