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This exception has no message.
java.lang.NullPointerException: 	at davmail.exchange.dav.DavExchangeSession.buildEmail(DavExchangeSession.java:643)	at davmail.exchange.dav.DavExchangeSession.buildMailPath(DavExchangeSession.java:582)	at davmail.exchange.dav.DavExchangeSession.buildSessionInfo(DavExchangeSession.java:505)	at davmail.exchange.ExchangeSession.(ExchangeSession.java:235)	at davmail.exchange.dav.DavExchangeSession.(DavExchangeSession.java:500)	at davmail.exchange.ExchangeSessionFactory.getInstance(ExchangeSessionFactory.java:146)	at davmail.exchange.ExchangeSessionFactory.getInstance(ExchangeSessionFactory.java:94)	at davmail.caldav.CaldavConnection.run(CaldavConnection.java:167)