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java.lang.IllegalStateException: open	at org.bson.util.Assertions.isTrue(Assertions.java:36)	at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:162)	at com.mongodb.DBApiLayer.killCursors(DBApiLayer.java:242)	at com.mongodb.DBApiLayer.cleanCursors(DBApiLayer.java:211)	at com.mongodb.Mongo$CursorCleanerThread.run(Mongo.java:801)