Accessed None for get Blackboard_returnvalue

I am trying to make an AI character. I made it in a separate project, and it worked. When I migrated it over to my main project, all sort of issues propped up. It wasn’t casting to the player properly to detect them. It’s Behaviour Tree and Blackboard were messed up and the tasks couldn;t reference properly. I managed to fix these issues, so when I run the game, I was surprised when the AI refused to move. When I stopped the game, I got this issue in the message log:

This is what I see when I open up the debug mode

This is where the error is originating from