Creating Health bar

I just switched from Unity to Unreal, and all I want to create is a health bar. I was following this doc:

I receive the following error:

It seems the Gameplay UI Widget is returning None. But how do you make it NOT do that lol?

I figured it out. I needed a switch server auth node to prevent this blueprint from running on the server. The docs should be updated for new people, like myself, who are making a multiplayer game.