在MTPasswordRequireBlock中获取错误

Question

我正在使用beaconplus，zip和dfu框架，我收到了这个错误。

  

无法转换类型＆＃39;（（String？） - ＆gt; Void）的值 - ＆gt;虚空＆＃39;预期参数类型＆＃39; MTPasswordRequireBlock！＆＃39; （又名＆＃39; ImplicitlyUnwrappedOptional＆lt;（可选＆lt;（可选） - ＆gt;（）＆gt;） - ＆gt;（）＆gt;＆＃39;）

我的代码是：

 @IBAction func connect(_ sender:UIButton) {
    /*
     manager： a MTCentralManager sharedInstance
     aMTPeripheral： a MTPeripheral instance
     */
    // listen the change of device connection state

    aMTPeripheral.connector.statusChangedHandler = {(_ status: ConnectionStatus,_ error:Error?) -> Void in


    }
    // Connect to the device
    // the aMTPeripheral is a device instance
    // !!!:Warnning: passwordRequire must not be NULL!!!

    // getting error in this line:

    manager.connect(toPeriperal: aMTPeripheral, passwordRequire: {(_ passwordBlock: MTPasswordBlock) -> Void in
        // the length of password string must be 8.
        // !!! read the input content from the UITextField as a password in development.
        var password = "minew123"
        passwordBlock(password)
    })
    // disconnec from the device.
    manager.disconnect(fromPeriperal: aMTPeripheral)
}