Animations will not play for unknown reasons?

What is the issue?
The issue is that for some of my zombie rigs, the animations will not play even when I am using the same scripts for them.

What solutions have you tried so far?
I tried deleting the zombie, then putting all of the animations and stuff on a clone of the zombie that works fine but that did not work. I also tried copying the id of the same animation and then pasting it. But the same result still happened. Is there a fix for this because the zombies will look like they are hovering toward the player.