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java.util.ConcurrentModificationException at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573) at java.util.AbstractCollection.toString(AbstractCollection.java:372) at java.util.Formatter.transform(Formatter.java:1421) at java.util.Formatter.doFormat(Formatter.java:1081) at java.util.Formatter.format(Formatter.java:1042) at java.util.Formatter.format(Formatter.java:1011) at java.lang.String.format(String.java:1803) at java.lang.String.format(String.java:1777) at timber.log.Timber$Tree.prepareLog(Timber.java:379) at timber.log.Timber$Tree.d(Timber.java:302) at timber.log.Timber$1.d(Timber.java:177) at timber.log.Timber.d(Timber.java:29) at com.localwizard.gcmutils.MyGcmListenerService.onMessageReceived(MyGcmListenerService.java:140) at com.google.android.gms.gcm.GcmListenerService.zzo(Unknown Source) at com.google.android.gms.gcm.GcmListenerService.zzn(Unknown Source) at com.google.android.gms.gcm.GcmListenerService.zzm(Unknown Source) at com.google.android.gms.gcm.GcmListenerService.zza(Unknown Source) at com.google.android.gms.gcm.GcmListenerService$1.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818)