Using Swift Argo framework : Could not find an overload for '<*>'

I am using Argo with Runes and Box framework , i have followed the Carthage way of adding frameworks. Here is my Model Class for Cities

import Argo
import Runes

struct Cities {

let cityName: String
let cityState: String

 }

extension Cities: Decodable {
static func create(cityName: String)(cityState: String!) -> Cities {
    return Cities(cityName: cityName, cityState: cityState)
}

static func decode(j: JSON) -> Decoded<Cities>
{
    return Cities.create <*> j <| "cityName" <*> j <| "cityState"

}
}

I get the following error : Could not find an overload for '<*>' that accepts the supplied arguments at return Cities.create <*> j <| "cityName" <*> j <| "cityState"

How can i fix this issue?

sample json :

{"cityName":"Panaji","cityState":"Goa"}

via Chebli Mohamed