Survival Shooter Zombear and Hellephant not moving

From Survival Shooter tutorial on Unity website:

The Zombunnies are spawning correctly and chasing me but the Zombears and Hellephants are stuck in one place (their animations are playing but they are not moving away from their spawn-positions). How do I fix this?

For anyone still having this problem, here is how I fixed it:

In the tutorial, Zombear and Hellefant are provided in the Models folder, but the package that I downloaded from the Asset Store did not have them. Therefore, I went to the _Complete-Game folder and copied these assets to my project. As mentioned above, neither of these assets would move from their spawn point. What I wasn’t aware of is that in the completed project, they have changed some of the scripts. So, if you find yourself with this problem, simply go to the ZomBear and Hellefant prefabs, delete the three enemy scripts (Enemy Movement, Enemy Health, Enemy Attack) and replace with the script that you have developed while following the tutorial. It works great after that.

i thing you should see the script in zombie maybe there is something missing