java.util.ConcurrentModificationException: This exception has no message.

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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)

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