Bug Can't play animation clip on animatorOverrideController

Hey all,

I'm working on a complex game character that uses procedural animations. As there can be multiple of these characters at the same time I'm using an animationOverrideController that overrides the original animation when the script gets initialized.

For some odd reason, when I try to play my animationClip using the animationOverrideController, Unity tells returns the message "Animator does not have an AnimationController". I've been wrestling with this for the past few hours but I can't figure it out.

The following is a code snippet of the code I'm running:

Code (CSharp):

1. clipCopy = baseClipWalking;
2.         clipCopy.name = baseClipWalking.name;
3.  
4.         if (veltharAnimator.runtimeAnimatorController != null)
5.         {
6.             overrideController = new AnimatorOverrideController(veltharAnimator.runtimeAnimatorController);
7.             overrideController["walking"] = clipCopy;
8.             veltharAnimator.runtimeAnimatorController = overrideController;
9.             Debug.Log(veltharAnimator.runtimeAnimatorController);
10.             veltharAnimator.Play(clipCopy.name, 0);
11.         }
12.         else
13.         {
14.             Debug.LogError("No AnimatorController found on " + veltharAnimator.gameObject.name);
15.         }

And this is a screenshot of the error message I recieve.