json4s FieldSerializer throws ScalaSig exception if used with TypeTag

build.sbt

name := "json4s-test"

version := "0.1"

scalaVersion := "2.12.6"

libraryDependencies ++= Seq(
  "org.json4s" %% "json4s-jackson" % "3.6.1",
  "org.scala-lang" % "scala-reflect" % "2.12.6"
)

Error.log

Exception in thread "main" org.json4s.package$MappingException: Can't find ScalaSig for class java.lang.ClassLoader
	at org.json4s.reflect.package$.fail(package.scala:95)
	at org.json4s.reflect.ScalaSigReader$.$anonfun$findClass$1(ScalaSigReader.scala:59)
	at scala.Option.getOrElse(Option.scala:121)
	at org.json4s.reflect.ScalaSigReader$.findClass(ScalaSigReader.scala:59)
	at org.json4s.reflect.ScalaSigReader$.findField(ScalaSigReader.scala:106)
	at org.json4s.reflect.ScalaSigReader$.read$1(ScalaSigReader.scala:50)
	at org.json4s.reflect.ScalaSigReader$.readField(ScalaSigReader.scala:55)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.$anonfun$fields$3(Reflector.scala:69)
	at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:234)
	at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:59)
	at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:52)
	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
	at scala.collection.TraversableLike.map(TraversableLike.scala:234)
	at scala.collection.TraversableLike.map$(TraversableLike.scala:227)
	at scala.collection.AbstractTraversable.map(Traversable.scala:104)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.fields(Reflector.scala:68)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.fields(Reflector.scala:81)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.fields(Reflector.scala:81)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.fields(Reflector.scala:81)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.properties(Reflector.scala:85)
	at org.json4s.reflect.Reflector$ClassDescriptorBuilder.result(Reflector.scala:191)
	at org.json4s.reflect.Reflector$.createDescriptor(Reflector.scala:53)
	at org.json4s.reflect.Reflector$.$anonfun$describe$1(Reflector.scala:48)
	at org.json4s.reflect.package$Memo.apply(package.scala:36)
	at org.json4s.reflect.Reflector$.describe(Reflector.scala:48)
	at org.json4s.Extraction$.decomposeObject$1(Extraction.scala:119)
	at org.json4s.Extraction$.internalDecomposeWithBuilder(Extraction.scala:230)
	at org.json4s.Extraction$.addField$1(Extraction.scala:111)
	at org.json4s.Extraction$.decomposeObject$1(Extraction.scala:142)
	at org.json4s.Extraction$.internalDecomposeWithBuilder(Extraction.scala:230)
	at org.json4s.Extraction$.addField$1(Extraction.scala:111)
	at org.json4s.Extraction$.decomposeObject$1(Extraction.scala:142)
	at org.json4s.Extraction$.internalDecomposeWithBuilder(Extraction.scala:230)
	at org.json4s.Extraction$.addField$1(Extraction.scala:111)
	at org.json4s.Extraction$.decomposeObject$1(Extraction.scala:140)
	at org.json4s.Extraction$.internalDecomposeWithBuilder(Extraction.scala:230)
	at org.json4s.Extraction$.decomposeWithBuilder(Extraction.scala:65)
	at org.json4s.Extraction$.decompose(Extraction.scala:244)
	at com.reactore.samples.JsonUtilities.toJson(JsonUtilities.scala:23)
	at com.reactore.samples.JsonUtilities.toJson$(JsonUtilities.scala:22)
	at com.reactore.samples.JsonUtilitiesImpl$.toJson(JsonUtilities.scala:36)
	at com.reactore.samples.JsonConverter$.delayedEndpoint$com$reactore$samples$JsonConverter$1(JsonConverter.scala:11)
	at com.reactore.samples.JsonConverter$delayedInit$body.apply(JsonConverter.scala:8)
	at scala.Function0.apply$mcV$sp(Function0.scala:34)
	at scala.Function0.apply$mcV$sp$(Function0.scala:34)
	at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
	at scala.App.$anonfun$main$1$adapted(App.scala:76)
	at scala.collection.immutable.List.foreach(List.scala:389)
	at scala.App.main(App.scala:76)
	at scala.App.main$(App.scala:74)
	at com.reactore.samples.JsonConverter$.main(JsonConverter.scala:8)
	at com.reactore.samples.JsonConverter.main(JsonConverter.scala)

JsonConverter.scala

package com.reactore.samples


case class Employee(id:Long, firstName:String, lastName:String) extends Copyable[Employee] with NameLike {
  override val name: String = firstName + " " + lastName
}

object JsonConverter extends App {

  val emp = Employee(1, "Yadu", "Krishnan")
  val json = JsonUtilitiesImpl.toJson(emp)
  println(json)
}

JsonUtilities.scala

package com.reactore.samples

import java.text.SimpleDateFormat

import org.json4s._
import org.json4s.JsonDSL._
import org.json4s.jackson.JsonMethods._
import scala.reflect.runtime.universe._

abstract class Copyable[T:TypeTag] {
  def tag:TypeTag[T] = typeTag[T]
}

trait NameLike {
  val name: String
}

trait JsonUtilities {
  self: TypeSerializers =>


  def toJson(obj: Any): String = {
    compact(Extraction.decompose(obj))
  }

}

trait TypeSerializers {
  implicit lazy val serializerFormats: Formats = new DefaultFormats {
    override def dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")

    override val fieldSerializers: List[(Class[_], FieldSerializer[_])] = List((classOf[NameLike], FieldSerializer[NameLike]()))
  }
}

object JsonUtilitiesImpl extends JsonUtilities with TypeSerializers