title: Animator is not playing an animation controller
body: <p>My animator doesn't work: I set a bool variable from code:</p>
  
  <pre><code>animatedObject.myAnimator.SetBool("MyVariable", true);
  animatedObject.SetActive(true);
  </code></pre>
  
  <p>But the animation isn't triggered. I'm sure that the animator's transition is correctly set to react with "MyVariable".</p>
  
  <p>Looking at the output console, I see that I have a warning:</p>
  
  <blockquote>
    <p>animator is not playing an animation controller</p>
  </blockquote>
  
  <p>What does that mean?</p>