If you happen to receive the 404 error, then you most likely need to reset the permalinks. In order to achieve that, you must perform the following steps:
Go to Settings-Permalinks in WordPress Admin
In order to see what you have selected you must check common settings. After doing this step, Save the changes.
Refresh the page and check if it works. Also, clear all forms of cache. More on clearing cache can be found here . If not, check the information below.
Other Permalink Informational Posts
Custom Permalinks Return 404 Errors – Check out this in depth post on 404 errors for permalinks
How To Set A Custom Permalink Link For Portfolio Posts – Check out this post on how to make a custom permalink for portfolio posts.