Animator.GotoState: State could not be found

I animate some 2D UI elements with animation clips that are collected in an animation controller, which is itself connected to an Animator on the root of the UI. The animation states are started with

Code (csharp):

1.  
2. const string ANIMATION_STATE_NAME = "SomeAnimationState";
3. …
4. animator.Play(ANIMATION_STATE_NAME);
5.  

About 90% of the time the animations function correctly, but now and then I get:

and

Anyone know what could be causing this?

 

I'm getting the same thing all of a sudden. Anyone Know what's up?

 

I get it too. How to fix it?

 

The year is 2021. Same.

 

You've spelled the name of your animation state incorrectly.

 

I am getting the same problem. all I know is that this only happens when I am trying to animate a canvas.

 

Hi i had this problem and i solved it by finding out and fixing the name in the animator, for me it had a trailing empty space that made it not fit with the name i called from code.