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

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java.lang.NullPointerException:
at com.mongodb.BaseCluster.getRandomServer(BaseCluster.java:204)
at com.mongodb.BaseCluster.getServer(BaseCluster.java:75)
at com.mongodb.DBTCPConnector.getServer(DBTCPConnector.java:650)
at com.mongodb.DBTCPConnector.access$300(DBTCPConnector.java:39)
at com.mongodb.DBTCPConnector$MyPort.error(DBTCPConnector.java:482)
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:301)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:268)

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