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You mean 4.22?
The errors in your screenshot are about the animation graph, not the animation blueprint. You need to switch to one of the other tabs in your window and edit the animation graph. It says some of the nodes don’t have transition arrows connecting them, so you can never reach the walk_idle animation.
Not sure if that’s what’s stopping you from compiling but that’s all I can see. Either that or you haven’t set up the logic for whether it can enter the transition or not.