Hilbert key error

hilbert-error-test.scala

import geotrellis.spark.io.index._
import geotrellis.spark.io.json._
import spray.json._

it("does not throw"){
  val k1 = SpaceTimeKey(0, 0, new DateTime(2000,1,1,0,0,0))
  val k2 = SpaceTimeKey(0, 0, new DateTime(2015,12,31,11,59,59))
  val kb = KeyBounds(k1, k2)
  val kim = HilbertKeyIndexMethod(12)
  val ki = kim.createIndex(kb)
  val ki2 = ki.toJson.compactPrint.parseJson.convertTo[KeyIndex[SpaceTimeKey]]

  ki2.indexRanges(kb)
}