Pagination Problem

Could you guys please help me with my site’s pagination

I installed WP-PageNavi today, and every time I click on another page (older entries) to see my old posts. It redirects me to a page where it says; NOT FOUND
The page you are looking is not here..

Even without WP-Pagenavi; I still have the same problem ??

Hopefully you guys could figure something out

My site; https://fakgooby.com/ So you could see what I’m talking about