Variable not valid

Hi all…
I have created this fuction for call my lobby menu
But when i call that variable it found the variable not valid. Why? I setted right, if i print that variable i get the name of the widget.

Please help me.

Widgets need a Player Controller they belong to.
Simply plug the controller into the “Owning Player”

It is arleady a player controll fuction. Sorry i don’t say that. This is a player controll class