title: Unable to execute dex: Multiple dex files define
body: <p>Whats worng ?why i have this problems?</p>
  
  <pre><code>Unable to execute dex: Multiple dex files define Lcom/nineoldandroids/animation/Animator$AnimatorListener;
  </code></pre>
  
  <p>and </p>
  
  <pre><code>Unable to execute dex: Multiple dex files define Lcom/nineoldandroids/animation/Animator$AnimatorListener;
  </code></pre>