MC从私人有效用户设置中读取

Question

当我按下按钮this error appears

时，这是视图控制器

这是我从中创建实例的类 创建该实例后，将显示错误 MC从私人有效用户设置中读取。

import UIKit

class authentication: NSObject {


    func runCode(password: String,email: String,name: String,  completionHandler:@escaping (Bool) ->()){

        struct f {
        static var flag = false

        }

        let Points : Int = 0

        let  passwardV : String = password

        let emailV : String = email

        let nameV : String = name

            // connect data base
            var request = URLRequest(url: URL(string: "https://www./////.com/API/register.php")!)
            // POST method
            request.httpMethod = "POST"
            // post senteace
            let postString = "Password="+passwardV+"&Email="+emailV+"&Name="+nameV

            request.httpBody = postString.data(using: .utf8)

            let task = URLSession.shared.dataTask(with: request) { data, response, error in
                guard let data = data, error == nil else {
                    // check for fundamental networking error
                    print("error=\(error)")
                    return
                }

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

                    if(myJSON!["error"] as! Bool == true){


                        print("alert")
                        f.flag =  false


           }
                    else {



                        print(myJSON!)
                        // save enformation in user's divice
                        let defaults = UserDefaults.standard

            defaults.set(nameV, forKey:"Name")

                       defaults.set(emailV, forKey:"Email")

                       defaults.set(Points, forKey:"Point")


                        defaults.synchronize()

                        //self.shouldPerformSegue(withIdentifier: "TOHomeCustomerVC", sender: self)
                    f.flag = true

                    }






                } catch let error as NSError {
                    print(error)

                }


            }

            completionHandler(f.flag)

            task.resume()
        }
}