ios - Converting Swift 2.3 to 3 error: cannot invoke dataTask with an argument list of type -

it project consists of registering user app , registered in mysql database. works in swift 2.3 want in swift 3 , not know how fix it.

error on urlsessions.shared.datatask

code:

else{          let url = url(string: "http://localhost/billpain/secure/register.php")!         let request = nsmutableurlrequest(url: url)         request.httpmethod = "post"         let body = "username=\(usernametxt.text!.lowercased())&password=\(passwordtxt.text!)&email=\(emailtxt.text!)&fullname=\(firstnametxt.text!)%20\(lastnametxt.text!)"         request.httpbody = body.data(using: string.encoding.utf8)          **urlsession.shared.datatask(with: request, completionhandler: {(data:data?, response:urlresponse?, error:nserror?) in**              if error == nil {                 dispatchqueue.main.async(execute: {                      {                         let json = try jsonserialization.jsonobject(with: data!, options: .mutablecontainers) as? nsdictionary                          guard let parsejson = json else {                         print ("error while parsing")                             return                         }                        let id = parsejson["id"]                         if id != nil {                              print(parsejson)                          }                      } catch {                         print("caught error: \(error)")                     }                  })              } else{                 print("error: \(error)")             }          }).resume() 

let url = url(string: "http://localhost/billpain/secure/register.php")! var urlrequest = urlrequest(url: url) urlrequest.httpmethod = "post" let body = "username=\(usernametxt.text!.lowercased())&password=\(passwordtxt.text!)&email=\(emailtxt.text!)&fullname=\(firstnametxt.text!)%20\(lastnametxt.text!)" urlrequest.httpbody = body.data(using: string.encoding.utf8)  let task = urlsession.shared.datatask(with: urlrequest) { (data, response, error) in if let error = error {     print("error:", error)     return }  {     guard let data = data else { return }     guard let json = try jsonserialization.jsonobject(with: data, options: []) as? [string: anyobject]  else { return }     print("json:", json) } catch {     print("error:", error) } }task.resume()