unknown object reference

I don’t know what node should I put on the object reference for “Cast to CharacterSelection_Display”. I tried “get player controller” doesn’t work. What node I should put there? By the way, “CharacterSelection_Display” is a Widget Blueprint which display on Controller Blueprint.

Create a reference to the CharacterSelection_Display widget in a variable when you create it. Then you can access it from the Player Controller to bind events that are fired from that Widget.

Thank you!!!