java.lang.UnsupportedOperationException: Toggle unread feature is supported only for UIDFolder instances

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java.lang.UnsupportedOperationException: Toggle unread feature is supported only for UIDFolder instances
at org.jasig.portlet.emailpreview.dao.javamail.JavamailAccountDaoImpl.setMessageReadStatus(JavamailAccountDaoImpl.java:602)
at org.jasig.portlet.emailpreview.dao.EmailAccountService.setSeenFlag(EmailAccountService.java:213)

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