title: How to use FirebaseInstanceId.getInstance().deleteInstanceId()?
body: <p>I want to delete my FireBaseInstance with</p>
  <pre><code>FirebaseInstanceId.getInstance().deleteInstanceId() 
  </code></pre>
  <p>I use a try/catch block but i get this error:</p>
  <pre><code>&gt; W/System.err: java.io.IOException: MAIN_THREAD W/System.err:     at
  &gt; com.google.firebase.iid.zzd.zzb(Unknown Source) W/System.err:     at
  &gt; com.google.firebase.iid.FirebaseInstanceId.deleteInstanceId(Unknown
  &gt; Source) W/System.err:     at
  &gt; package.class.onCreate(DatenLadenActivity.java:57)
  &gt; W/System.err:     at
  &gt; android.app.Activity.performCreate(Activity.java:6272) W/System.err:  
  &gt; at
  &gt; android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
  &gt; W/System.err:     at
  &gt; android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2387)
  &gt; W/System.err:     at
  &gt; android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
  &gt; W/System.err:     at
  &gt; android.app.ActivityThread.access$900(ActivityThread.java:157)
  &gt; W/System.err:     at
  &gt; android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356)
  &gt; W/System.err:     at
  &gt; android.os.Handler.dispatchMessage(Handler.java:102) W/System.err:    
  &gt; at android.os.Looper.loop(Looper.java:148) W/System.err:     at
  &gt; android.app.ActivityThread.main(ActivityThread.java:5525)
  &gt; W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
  &gt; W/System.err:     at
  &gt; com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
  &gt; W/System.err:     at
  &gt; com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
  </code></pre>
  <p>Thanks for your answers :)</p>