java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.springframework.mail.javamail.MimeMessageHelper.validateAddresses(MimeMessageHelper.java:243)
at com.spider.scoreboard.email.SmtpEmailSender$SmtpMessagePreparator.prepare(SmtpEmailSender.java:59)

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