Animation Runtime Controller - Change through code? C#

I want to have a store system in my game, and with the system I'm creating it requires a new animation controller on the player. For some reason I can't seem to make it work. Here is the code (C#):

 if (PlayerPrefs.GetInt ("Current Player") == 0) {
         anim.runtimeAnimatorController = Resources.Load ("Animations/Player.controller") as RuntimeAnimatorController;
         }
 if (PlayerPrefs.GetInt ("Current Player") == 1) {
         anim.runtimeAnimatorController = Resources.Load ("Animations/GreenPlayerController.controller") as RuntimeAnimatorController;
         }

I don't understand what is going wrong with this. I get no errors, but it does say that the Runtime Controller is empty so I know something is happening. Also I have checked to make sure the PlayerPref is working correctly and it is. I've searched everywhere but I can't find anything.

Thanks in advance!

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