Hello my friends,
So, i have a menu in a different world. The menu is working, but when i click on play, goes to another world where is the map! But i have a animation its wake up, he do de animation but when i click “w” to move forward he dont move. And then i close window and appears this:
SetInputMode_GameOnly expects a valid player controller as target
on the node where you have set input mode, you need to plugin a player reference. open the BP and it should throw an error about that node, drag off the pin and get player controller
Anyone still having trouble, make sure you are looking at the correct “set input” node. EVERY set input node needs a player controller ref.
I’m running into this issue as well, but I don’t think I ever did use a set input mode. I have the menu level which works, but when I press play it throws that same error, and I have no clue where in my project it is trying to direct me to.
i had the same problem but i fixed it : 1- Use Function library then add valid node , if you want to add a node like delay use macro library add vaild node if valid : your logic if not valid use do n node 
worked for me