There are frequent errors you can encounter in your WordPress site but WordPress Error 404 is most common. WordPress 404 Error hit on your website when you request any page to the server but it doesn’t redirect to that same page. Maybe the URL or permalink of such pages has been changed. Users face this problem when they type the wrong URL address.
The best way to fix this issue is to modify your .htaccess file and past the new URL on that and unload it to the main server root directory. If things are ok after that, then it is good, but if the problem persists then you must contact WordPress Expert’s team for that.