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java.lang.Character: 	at org.bson.BSONEncoder._putObjectField(BSONEncoder.java:213)	at org.bson.BSONEncoder.putObject(BSONEncoder.java:123)	at org.bson.BSONEncoder.putObject(BSONEncoder.java:69)	at com.mongodb.OutMessage.putObject(OutMessage.java:189)	at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:245)	at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:209)	at com.mongodb.DBCollection.insert(DBCollection.java:82)	at undefined.QMater_IO.insert_QMaster(QMater_IO.java:32)	at undefined.QMater_IO.main(QMater_IO.java:51)