java.util.NoSuchElementException: key not found: mem_ext

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Check if the field you try to read really exists in the database. If it is optional, just use com.mongodb.casbah.commons.MongoDBObject#getAs

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java.util.NoSuchElementException: key not found: mem_ext
at scala.collection.MapLike$class.default(MapLike.scala:228)
at scala.collection.AbstractMap.default(Map.scala:59)
at scala.collection.MapLike$class.apply(MapLike.scala:141)
at firrtl.passes.InferTypes$.firrtl$passes$InferTypes$$infer_types_e$1(Passes.scala:173)

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