If theres even slight change or modification in the site, it will become inaccessible. This WordPress Error 404is frustrating when youre doing something important on your site. But, fixing this error is quick and simple with these effective troubleshooting solutions:
There can be issues in the way that WordPress creates permalinks. Thus, you need to reset your permalinks first.
Many times, plugins and themes can affect the WordPress URL structure and cause this error to happen. This happens because of their settings. To get rid of this, make sure to deactivate your plugins one by one to see which plugin was causing the issue. Disabling the plugins can also help you in fixing many other WordPress problems.
If these solutions dont work for your problems, you can try restoring the WordPress .htaccess File.
You can also get in touch with the WordPress team for details.