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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(