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java.lang.NullPointerException: 	at javax.mail.internet.MimeUtility.getEncoding(	at javax.mail.internet.MimeUtility.getEncoding(	at javax.mail.internet.MimeBodyPart.updateHeaders(	at javax.mail.internet.MimeBodyPart.updateHeaders(	at javax.mail.internet.MimeMultipart.updateHeaders(	at javax.mail.internet.MimeBodyPart.updateHeaders(	at javax.mail.internet.MimeMessage.updateHeaders(	at javax.mail.internet.MimeMessage.saveChanges(	at javax.mail.internet.MimeMessage.writeTo(	at javax.mail.internet.MimeMessage.writeTo(	at com.atlassian.confluence.servlet.ExportWordPageServer.service(