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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)