How to add media player, play / pause controls to widget blueprint

Using the below i am able to play a media video on a static mesh when I press a button on my widget using the On Clicked event.

I get the following error in the message log however.

Blueprint Runtime Error: "Accessed None trying to read property CallFunc_Create_ReturnValue". Blueprint:  Lobby Function:  Execute Ubergraph Lobby Graph:  EventGraph Node:  Bind Event to Video Dispatcher

I cannot seem to resolve this error?
Long term I would like to be able to play, pause, fast forward etc and skip to the next video in a media playlist