Polling Error in Gatling

Hi There

I am a bit new to Gatling, so I apologize in advance for my naive query.
I am trying to achieve polling for a post request (as I need to subscribe to certain events, for which I would like to get updates)

My scenario looks like:

val scn = scenario("LivePolling")
  .exec(
    polling.pollerName("LiverServer_Poll")
      .every(10 seconds)
      .exec(http("LiveServ_POST")
        .post("/push")
          .headers(headers_0)
          .formParam("Event1!!!", ""))
  )
  .pause(5)
  .exec(polling.stop)