QuickBlox中不存在必需的会话

Question

尝试使用QuickBlox注册用户时，我也遇到相同的错误。

iOS 11.3， QuickBlox SDK 2.17.1

有关它的更多详细信息，

1. 我已经点击了https://quickblox.com/developers/IOS链接以进行集成
2. 在didFinishLaunchingWithOptions方法中设置QBSettings。
3. 在主视图控制器中实现用户注册代码。

QBSettings代码：

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
      // Override point for customization after application launch.
      QBSettings.applicationID = xxxxx
      QBSettings.authKey = "xxxxxxxxxxxx"
      QBSettings.authSecret = "xxxxxxxxxxxx"
      QBSettings.accountKey = "xxxxxxxxxxxx"
      QBSettings.logLevel = .debug
      return true
    }

注册代码：

    let user = QBUUser()
    user.login = "test_123@gmail.com"
    user.password = "test_123456"

    QBRequest.signUp(user, successBlock: { (response, object) in
        print("Signup user successfull: \(object)")
    }) { (response) in
        print("Signup user Error: \(String(describing: response.error))")
    }

错误日志：

error: Request failed: unauthorized (401)
reasons: {
errors =     {
    base =         (
        "Required session does not exist"
    );
};
}

请任何人知道相同的问题，然后提供一些解决方案。 谢谢！