My Zombunny isn't moving...help!

I am currently brand-new to Unity 5 on my Mac and I'm in the process of completing the Project: Survival Shooter. However, when I tried to make the Zombunny move towards the player it didn't work. His feet were moving but not actually moving anywhere. Does anybody know what I have done wrong? (I am following the tutorial by the way).

Here are two videos to see exactly what I mean: https://www.youtube.com/watch?v=Ui1JtKT1EOE and https://www.youtube.com/watch?v=gItGNqPxJOs

I am following this set of tutorials just in case you want to check something with it: http://unity3d.com/learn/tutorials/projects/survival-shooter