Search Option is not working

Hello,

First thank you for this awesome theme. I have been working in a new website, now it has some content there (mainly static pages not blog posts) when I write something in the search option it always return to this message (Not Found,Sorry, but the page you were trying to view does not exist.It looks like this was the result of either:a mistyped address
an out-of-date link).

I am pretty that the content is there. Do you have any idea why in the search results I always receive that message?

This is the URL of my website https://www.mexicanosenpolonia.com/welcome/

Thank you very much