尝试导入图像时出现Metadata.framework错误

在我的应用程序中导入图像后，我在Xcode的调试区域中收到以下消息：

"[21950:1148196] Metadata.framework [Error]: couldn't get the client port".

如何摆脱这个错误？

这是我上传图片的代码：

@IBAction func importButton(sender: AnyObject) {

    let uploadFile: NSOpenPanel = NSOpenPanel()

    uploadFile.allowsMultipleSelection = false
    uploadFile.canChooseFiles = true
    uploadFile.canChooseDirectories = false

    uploadFile.runModal()

    let chosenPicture = uploadFile.URL

        if(chosenPicture != nil) {

            let pictureImport = NSImage(contentsOfURL: chosenPicture!)
            imageWell.image = pictureImport
        }
}