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Delete file failed: 550 Delete operation failed.
entejavax.jms.JMSException: Delete file failed: 550 Delete operation failed.	at org.apache.activemq.blob.FTPBlobDownloadStrategy.deleteFile(FTPBlobDownloadStrategy.java:66)	at com.skynetwork.sync.FileSyncListener.onMessage(FileSyncListener.java:66)	at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1298)	at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131)	at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202)	at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)	at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)