The error says "You must deploy an implementation for the move method"

class Point {
    var x: Int
    var y: Int

    init(x: Int, y: Int) {
        self.x = x
        self.y = y
    }
}

enum Direction {
    case left
    case right
    case up
    case down
}

class Robot {
    var location: Point

    init() {
        self.location = Point(x: 0, y: 0)
    }

    func move(direction: Direction) {
        switch direction{
          case .left:
            self.location.x = self.location.x - 1
          case .right:
            self.location.x = self.location.x + 1
          case .up:
            self.location.y = self.location.y + 1
          case .down:
            self.location.y = self.location.y - 1
           }
    }
}