You’ve created a custom post type, but WordPress says your posts can’t be found…

This strange thing happened to me earlier today – added a custom post type earlier this week, published an article this afternoon – but then I couldn’t view the published version – WordPress said it couldn’t be found (404 error).

Solution:

Go to your dashboard, and then to settings/permalinks.

Scroll to the bottom and click “Save Changes”. This will force WordPress to update permalink settings and your posts in your custom post type should now work.