Json4s unable to desrialize in scala

I need a help in json desrialization in scala using Json4s. I get the following error when I try to desrialize the json

scala.collection.immutable.Map$Map1 cannot be cast to 
 LocationServiceTest$$anonfun$1$LocationList$3
 java.lang.ClassCastException: scala.collection.immutable.Map$Map1 cannot be cast to 
 LocationServiceTest$$anonfun$1$LocationList$3
at LocationServiceTest$$anonfun$1.apply$mcV$sp(LocationServiceTest.scala:34)
at LocationServiceTest$$anonfun$1.apply(LocationServiceTest.scala:16)
at LocationServiceTest$$anonfun$1.apply(LocationServiceTest.scala:16)

My Json as follows :

    {
  "locations" : [
    {
      "country": "YY",
      "placeName": "YY",
      "latitude": "YY",
      "longitude": "YY"
    },
    {
      "country": "XX",
      "placeName": "XX",
      "latitude": "XX",
      "longitude": "XX"
    },

My code :

case class Location(country: String, placeName: String, latitude: Double, longitude: Double)
 val locations = parse(scala.io.Source.fromFile("input.json").mkString)
  println(locations.values.asInstanceOf[LocationList])

Using extract(format, manifest) also fails.. Can someone please help.

The code is shown below:

object Test extends App {
  import org.json4s._
  import org.json4s.jackson.JsonMethods._
  implicit val formats =DefaultFormats

  val str = scala.io.Source.fromFile("input.json").mkString

  case class Location(country: String, placeName: String, latitude: String, longitude: String)

  val dataObj= parse(str)
  val locObj = (dataObj \ "locations").extract[Seq[Location]]

  println(locObj)
}

The output:

List(Location(YY,YY,YY,YY), Location(XX,XX,XX,XX))

Note that in case class, latitude and longitude are string since in json, you declared them as string.

Let me know if it helps!!