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junit.framework.AssertionFailedError: create serial handler list must not empty	at junit.framework.Assert.fail(Assert.java:50)	at junit.framework.Assert.assertTrue(Assert.java:20)	at com.liulishuo.filedownloader.FileDownloader.createSerialHandler(FileDownloader.java:571)	at com.liulishuo.filedownloader.FileDownloader.start(FileDownloader.java:247)	at com.liulishuo.filedownloader.FileDownloadQueueSet.start(FileDownloadQueueSet.java:146)	at com.being.fame.service.SchedulerJobService$1.run(SchedulerJobService.java:216)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:158)	at com.being.fame.thread.WorkerHandlerThread.run(WorkerHandlerThread.java:47)