ios - Swift 4.1 (Xcode 9.3) 中的错误域 = NSCocoaErrorDomain 代码 = 3840

Question

我正在使用 MYSQL 创建 iOS 应用程序。在应用程序中，我使用了以下代码。

import UIKit

class ViewController: UIViewController {

//URL to our web service
let URL_SAVE_TEAM = URL(string:"http://my_url/ios_api/api/createteam.php")

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

//TextFields declarations
@IBOutlet weak var textFieldName: UITextField!
@IBOutlet weak var textFieldMember: UITextField!

@IBAction func buttonSave(_ sender: UIButton) {

    //creating NSMutableURLRequest
    let request = NSMutableURLRequest(url: URL_SAVE_TEAM!)

    //setting the method to post
    request.httpMethod = "GET"

    //getting values from text fields
    let teamName=textFieldName.text
    let memberCount = textFieldMember.text

    //creating the post parameter by concatenating the keys and values from text field
    let postParameters = "name="+teamName!+"&member="+memberCount!;

    //adding the parameters to request body
    request.httpBody = postParameters.data(using: String.Encoding.utf8)


    //creating a task to send the post request
    let task = URLSession.shared.dataTask(with: request as URLRequest){
        data, response, error in

        if error != nil{
            print("error is \(error)")
            return;
        }

        //parsing the response
        do {
            //converting resonse to NSDictionary
            let myJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

            //parsing the json
            if let parseJSON = myJSON {

                //creating a string
                var msg : String!

                //getting the json response
                msg = parseJSON["message"] as! String?

                //printing the response
                print(msg)

            }
        } catch {
            print(error)
        }

    }
    //executing the task
    task.resume()
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

在该代码行上，它显示以下错误。我在谷歌搜索并找不到解决方案。请帮我解决这个问题。

let myJSON = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

错误域 = NSCocoaErrorDomain 代码 = 3840 “JSON 文本没有以数组或对象开头，并且允许未设置片段的选项。” UserInfo={NSDebugDescription=JSON 文本没有以数组或对象开头，并且允许未设置片段的选项。}