If you encounter a 404 Not Found error on all pages of your website after installing or activating the Lunex theme, it usually means that your permalink settings need to be refreshed.
How to Fix the 404 Error
- Log in to your WordPress Dashboard.
- Navigate to:
Settings → Permalinks - Without changing any settings, scroll down and click the Save Changes button.
This action flushes and refreshes WordPress rewrite rules and usually resolves the 404 error on your pages and posts.