How to use cross site tokens in gatling

LoginAndAddDecision.scala

package com.scropt

import scala.concurrent.duration._

import io.gatling.core.Predef._
import io.gatling.http.Predef._
import io.gatling.jdbc.Predef._

class LoginAndAddDecision extends Simulation {

	val httpProtocol = http
		.baseURL("https://opg.scropt.com")
		.inferHtmlResources()

    val uri1 = "https://opg.scropt.com:443"

	val scn = scenario("LoginAndAddDecision")
		.exec(http("request_0")
			.get("/login"))
        	.check(
          		regex("""<input name="login[_token]" type="hidden" value="([^"]*)" />""")
          	.saveAs("loginToken")))
		.pause(6)
		.exec(http("request_1")
			.post("/login")
			.formParam("login[email]", "laydeputy@publicguardian.gsi.gov.uk")
			.formParam("login[password]", "PDEtnLay1234")
			.formParam("login[login]", "")
			.formParam("login[_token]", "${loginToken}"))
		.pause(3)
		.exec(http("request_2")
			.get("/report/1/decisions"))
		.pause(2)
		.exec(http("request_3")
			.get("/report/1/decisions/add"))
			.check(
          		regex("""<input name="login[_token]" type="hidden" value="([^"]*)" />""")
          	.saveAs("addDecisionToken")))
		.pause(13)
		.exec(http("request_4")
			.post("/report/1/decisions/add")
			.formParam("decision[description]", "Very important Stuff")
			.formParam("decision[clientInvolvedBoolean]", "1")
			.formParam("decision[clientInvolvedDetails]", "We talked")
			.formParam("decision[save]", "")
			.formParam("decision[_token]", "${addDecisionToken}"))
		.pause(5)
		.exec(http("request_5")
			.get("/report/1/overview"))

	setUp(scn.inject(atOnceUsers(1))).protocols(httpProtocol)
}