Confounded by an error when working on back button going to Main Menu

Hi all. So I have been working with the multiplayer tutorials from UE4. I am having trouble with a menu issue. When I hit back on my Host Game Menu there is no problem. However pressing back on my Join Menu or accept and back on my Options Menu I get this error:

** Error Blueprint Runtime Error: Accessed None trying to read property GameInstanceRef from function: ‘ExecuteUbergraph_OptionsMenu’ from node: Show Main Menu in graph: EventGraph in object: OptionsMenu with description: Accessed None trying to read property GameInstanceRef . **

I’m just baffled as they all have the same script seen here: Here are images of errors of where the errors are trying to connect to as far as the path goes. They all link when double clicked. I’m hopelessly lost here:

(Back button issue) When clicking on the Show Main Menu Container: It takes me where it’s supposed to from blueprint but not in game:

This is for all back buttons in sub menus beyond host game which takes me back to main menu. Host game looks like the rest seen here:

As far as accept goes it should take me back to the main menu in settings as seen here:

As you can see. All of them are pointed back to the same place and only one works. Any help would be greatly appreciated. I’ve redone the videos and nothing.