About Extra argument in call error protection (alamofire?)

import UIKit 
import MapKit 
import Alamofire
Class ViewController:
    UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
        @IBOutlet weak varmap1: MKMapView!
        @IBOutletweak varpickerView:UIPickerView!
        @ IBAction func nextButton(_sender:Any){
            performSegue(withIdentifier: "recommend", sender:nil)
        } 
        override func viewDidLoad(){
            super.viewDidLoad() 
        }
        override funcdidReceiveMemoryWarning(){
            super.didReceiveMemoryWarning()
                // Dispose of any resources that can be recreated.
        }
    }
where the func getArticles() {//← error appears
    Alamofire.request (.POST, "https://www.google.com") 
}
}