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java.lang.NullPointerException: 	at com.mongodb.DBPort.authenticate(DBPort.java:367)	at com.mongodb.DBPort.checkAuth(DBPort.java:402)	at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:289)	at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:269)