Animation Not Activating

Hi, I am in the works of trying to create a fighting game, and when I go to test my animations; when I go to my other model and hit my key to execute the animation, my characters do not reach and after a couple of seconds, I receive the error message below…

Blueprint Runtime Error: “Accessed None trying to read property CallFunc_GetController_ReturnValue_1”. Node: Set Control Rotation Graph: Face to Face Function: Face To Face Blueprint

Any idea as to why this happens? I also provided a screenshot of my set-up. If anyone have any tips. I am using Unreal Engine 5 Version 5.4.4

If that character doesnt have a controller(being possessed by a player) it will give none.

Is it an Ai ennemy ?, then you will need to assign an ai controller to him.

I appreciate that a lot, thank you, kindly. The error message stopped showing. The animation did not work, but this is a step in the right direction, I believe. Just got to see why it is not activating.