WordPress Child Pages Showing 404 page error

Link to your site? The theme you use (child theme or not) shouldn’t effect your page slugs.

Here is my site url Blogger Templates

and here is a child page that I’ve create but its still showing 404 page error.

https://www.protemplateslab.com/blogger-templates/topics/

Nope I’ve not used child theme.

I thin that’s not theme problem because I’ve uploaded the same theme on one of my another site and its working fine.