com.example.app.FBGraphAPI$User$3: This exception has no message.

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com.example.app.FBGraphAPI$User$3:
at org.json4s.reflect.ScalaSigReader$.findClass(ScalaSigReader.scala:42)
at org.json4s.reflect.ScalaSigReader$.readConstructor(ScalaSigReader.scala:26)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder.ctorParamType(Reflector.scala:108)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder$$anonfun$6.apply(Reflector.scala:98)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.immutable.List.foreach(List.scala:318)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractTraversable.map(Traversable.scala:105)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder.ctorParamType(Reflector.scala:95)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder$$anonfun$constructorsAndCompanion$3$$anonfun$13.apply(Reflector.scala:149)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractTraversable.map(Traversable.scala:105)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder$$anonfun$constructorsAndCompanion$3.apply(Reflector.scala:122)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:34)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractTraversable.map(Traversable.scala:105)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder.constructorsAndCompanion(Reflector.scala:116)
at org.json4s.reflect.Reflector$ClassDescriptorBuilder.result(Reflector.scala:157)
at org.json4s.reflect.Reflector$.createDescriptor(Reflector.scala:50)
at org.json4s.reflect.Reflector$$anonfun$describe$1.apply(Reflector.scala:44)
at org.json4s.reflect.Reflector$$anonfun$describe$1.apply(Reflector.scala:44)
at org.json4s.reflect.package$Memo.apply(package.scala:39)
at org.json4s.reflect.Reflector$.describe(Reflector.scala:44)
at org.json4s.Extraction$.extract(Extraction.scala:304)
at org.json4s.Extraction$.extract(Extraction.scala:42)
at org.json4s.ExtractableJsonAstNode.extract(ExtractableJsonAstNode.scala:21)
at com.example.app.FBGraphAPI$.getUserDetails(FBGraphAPI.scala:24)

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