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

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java.lang.String:
at org.json4s.reflect.package$.fail(package.scala:96)
at org.json4s.Extraction$ClassInstanceBuilder.org$json4s$Extraction$ClassInstanceBuilder$$buildCtorArg(Extraction.scala:443)
at org.json4s.Extraction$ClassInstanceBuilder$$anonfun$14.apply(Extraction.scala:463)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractTraversable.map(Traversable.scala:105)
at org.json4s.Extraction$ClassInstanceBuilder.org$json4s$Extraction$ClassInstanceBuilder$$instantiate(Extraction.scala:451)
at org.json4s.Extraction$ClassInstanceBuilder$$anonfun$result$6.apply(Extraction.scala:491)
at org.json4s.Extraction$ClassInstanceBuilder$$anonfun$result$6.apply(Extraction.scala:488)
at org.json4s.Extraction$.org$json4s$Extraction$$customOrElse(Extraction.scala:500)
at org.json4s.Extraction$ClassInstanceBuilder.result(Extraction.scala:488)
at org.json4s.Extraction$.extract(Extraction.scala:332)
at org.json4s.Extraction$CollectionBuilder$$anonfun$6.apply(Extraction.scala:341)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.immutable.List.foreach(List.scala:318)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractTraversable.map(Traversable.scala:105)
at org.json4s.Extraction$CollectionBuilder.mkCollection(Extraction.scala:341)
at org.json4s.Extraction$CollectionBuilder.result(Extraction.scala:365)
at org.json4s.Extraction$.extract(Extraction.scala:320)

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