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

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java.lang.NullPointerException:
at javax.mail.internet.MimeUtility.checkAscii(MimeUtility.java:915)
at javax.mail.internet.MimeUtility.encodeWord(MimeUtility.java:539)
at javax.mail.internet.MimeUtility.encodeText(MimeUtility.java:373)
at javax.mail.internet.MimeMessage.setSubject(MimeMessage.java:694)
at undefined.SendMail.doPost(SendMail.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:521)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at java.lang.Thread.run(Thread.java:484)

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