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java.lang.Character: 	at org.bson.BSONEncoder._putObjectField(	at org.bson.BSONEncoder.putObject(	at org.bson.BSONEncoder.putObject(	at com.mongodb.OutMessage.putObject(	at com.mongodb.DBApiLayer$MyCollection.insert(	at com.mongodb.DBApiLayer$MyCollection.insert(	at com.mongodb.DBCollection.insert(	at QMater_IO.insert_QMaster(	at QMater_IO.main(