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java.util.ConcurrentModificationException at java.util.ArrayList$Itr.next(ArrayList.java:831) at com.vibhinna.sreni.DownloadIntentService.checkDownloadQueue(DownloadIntentService.java:261) at com.vibhinna.sreni.DownloadIntentService.access$000(DownloadIntentService.java:35) at com.vibhinna.sreni.DownloadIntentService$Downloader.onPostExecute(DownloadIntentService.java:420) at com.vibhinna.sreni.DownloadIntentService$Downloader.onPostExecute(DownloadIntentService.java:402) at android.os.AsyncTask.finish(AsyncTask.java:660)