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java.lang.IllegalStateException: Folder not open	at javax.mail.Folder.getMessages(Folder.java:925)	at org.mule.providers.email.RetrieveMessageReceiver.poll(RetrieveMessageReceiver.java:304)	at org.mule.providers.AbstractPollingMessageReceiver.run(AbstractPollingMessageReceiver.java:115)	at edu.emory.mathcs.backport.java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)	at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.runAndReset(FutureTask.java:198)	at edu.emory.mathcs.backport.java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:138)	at edu.emory.mathcs.backport.java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:238)	at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:987)	at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:528)	at java.lang.Thread.run(Thread.java:595)