spark sortby compile error

gistfile1.scala

  case class Person(first: String, last: String, age: Int)
  
  val parse = (s: String) => {
    val split = s.split("\\|")
    Person(split(0), split(1), split(2).toInt)
  }
  object AgeOrdering extends Ordering[Person] {
    def compare(a:Person, b:Person) = a.age compare b.age
  }


def main(args: Array[String]) {
  ...
  slidingwindow_words.foreachRDD(foreachFunc = rdd => {
    rdd.sortBy(parse, true, 2)(AgeOrdering, classTag[Person])
  
  ...
  }
}