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

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at com.mongodb.BaseCluster.getRandomServer(
at com.mongodb.BaseCluster.getServer(
at com.mongodb.DBTCPConnector.getServer(
at com.mongodb.DBTCPConnector.access$300(
at com.mongodb.DBTCPConnector$MyPort.error(
at com.mongodb.DBTCPConnector.innerCall(

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