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: http://imgur.com/a/RQ7x7 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: http://imgur.com/a/9I7T6

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: http://imgur.com/a/9ONti

As far as accept goes it should take me back to the main menu in settings as seen here: http://imgur.com/a/tfLHS

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.

Images: