title: React Native Android Crash: java.lang.NoClassDefFoundError
body: <p>I just recently launched my React Native Android app into production and a bunch of users are experiencing the following crash:</p>
  
  <pre><code>java.lang.NoClassDefFoundError
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Jsy93.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jsy93.png" alt="enter image description here"></a></p>
  
  <p>I'm not sure how to go about debugging this. I can't seem to reproduce it locally on any of my physical devices, and because it's Java and not JavaScript, I'm a bit unfamiliar. It looks like these users are all on Android 4.x, could that have something to do with it?</p>
  
  <p>If you could help point me in the right direction, I would really appreciate it!</p>