title: Deobfuscate production Android errors via uploading proguard rules mapping file to google play console
body: <p>Suddenly my released app crashed while opening just after installing the app from play-store.
  But problem is that when I am running the code in Android Studio in debug mode app does not crash.</p>
  
  <p>When I looked for crash error on google play console I saw some obfuscated code not easy to guess from where error was coming.</p>
  
  <pre><code>java.lang.NullPointerException: 
    at com.wl.model.a.b (Unknown Source)
    at com.wl.model.a.a (Unknown Source)
    at com.wl.model.a$1.a (Unknown Source)
    at b.w$a.b (Unknown Source)
    at b.a.b.run (Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1113)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:588)
    at java.lang.Thread.run (Thread.java:818)
  </code></pre>
  
  <p>From error I know there is some null pointer exception but could not trace its origin.</p>
  
  <p>Google play console says upload de-obfuscation file to de-obfuscate the error code.</p>
  
  <p>Now my problem is that I am not able to locate the de-obfuscation file in my project source folder.</p>
  
  <p>I tried uploading the pro-guard rules file but google play console rejects it.</p>
  
  <p>Please provide me the path or place where I can look for de-obfuscation file (where it is usually present).</p>