macos – (NSMenuItem)：缺少setter或实例变量

2015-04-02 12:20:14.642 test[21167:257788] Failed to connect     
(testApp) outlet from (test.AppDelegate) to (NSMenuItem): missing 
setter or instance variable
inserted id: 122

我在菜单中添加了一个menuItem并将一个函数连接到它时发生了.

我不知道问题是什么.该应用程序工作正常,但我不认为忽略错误是一个明智的想法.
setter或实例变量是什么意思？为什么需要它？

更新：这是相关代码：

import Cocoa
import Foundation

@NSApplicationMain
class AppDelegate: NSObject,NSApplicationDelegate {

@IBOutlet weak var window: NSWindow!
@IBOutlet weak var statusMenu: NSMenu!

let statusItem = NSStatusBar.systemStatusBar().statusItemWithLength(-1)

func applicationDidFinishLaunching(aNotification: NSNotification) {
    let icon = NSImage(named: "statusIcon")

    statusItem.image = icon
    statusItem.menu = statusMenu
    // Time for constant repeat
    NSTimer.scheduledTimerWithTimeInterval(1,target: self,selector: "timerRepeat",userInfo: nil,repeats: true)
}

// Method to call the tracking core
func timerRepeat() {
    //....
}

@IBAction func frontEnd(sender: NSMenuItem) {
    var targetURL : String = NSBundle.mainBundle().resourcePath!
    targetURL = targetURL + "/" + "front.app"
    let workspace = NSWorkspace()
    workspace.launchApplication(targetURL)
}


@IBAction func menuClicked(sender: NSMenuItem) {
    NSApplication.sharedApplication().terminate(self)
}   
}