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java.lang.NullPointerException at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:226) at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:299) at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1375) at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1021) at javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:419) at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1354) at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2107) at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2075) at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1770) at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1749) at com.atlassian.confluence.servlet.ExportWordPageServer.service(ExportWordPageServer.java:188)