Actor object reference not compatible with object reference

I’m following this ( 13: Unreal Chess: Game Mode Initialization - YouTube ) tutorial but get this issue where my get array won’t connect to my set reference variable.

The Get and Length is connected to “get all actors of class”.

@Mr.Beluved Did you set the Board Ref variable to a type of “BP Board”? (3:38 of video) and your get all actors of class the class filter set to “BP Board”? (13:09)

The var is fine judging by the error message; but OP did this:

@Mr.Beluved Disconnect all nodes from Get All Actors of Class. Select the class from the dropdown first, only then start dragging wires. The result if you do it in the corrects order: