java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.tomdroid.sync.SyncService.sendMessage(SyncService.java:519)
at org.tomdroid.sync.sd.SdCardSyncService.access$300(SdCardSyncService.java:47)
at org.tomdroid.sync.sd.SdCardSyncService$Worker.run(SdCardSyncService.java:220)
at org.tomdroid.sync.SyncService$1.run(SyncService.java:156)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)

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