Have problem to pick up direct blueprint communication in my first puzzle game TicTacToe

Hi, This is my first time writing to this forum.
I just started to learn the basic of UE4’s direct blueprint communication with the puzzle template to create a basic TicTacToe game. The screenshot is what happened while trying to get IsX variable from Puzzle Block Grid class under PuzzleBlock class. Owining Grid is an object reference to grid, IsX is the variable node that stored in grid that I failed to connect to the owning grid and it said “Puzzle Block Grid Reference is not compatible with Array of Puzzle Block Grid References.” (Please find the screenshot below)

I know I kinda stucked to a noob suitation. I will be very apperciated if anyone can help me out of this.
Thank You.

Sorry I’ve already found out what’s the problem there. Thank you. :smiley: