用Alamofire SWIFT获取多部分FormData的POST参数误差

我无法上传图片到服务器获取。显示上载进度upload.uploadProgress但之后upload.responseJSON是nil错误。我已经尽力了，但解决不了这个问题。任何人都可以帮我。我做错什么了？当我调试它时{ (result) in switch result {结果无效。

邮递员钥匙：(参数)

ImageList -- for images
ProjectUnitID  -- 8568816

SWIFT代码：

if asset.type == .photo {
   let displayImage = asset.fullResolutionImage!images?.append(d)
   let token = UserDefaults.standard.string(forKey: "newToken")
   let image = displayImage
   let imgData = image.jpegData(compressionQuality: 0.2)!
   let parameters = ["ProjectUnitId": 8568816]                 
   Alamofire.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(imgData, withName: "ImageList",fileName: "file.jpg", mimeType: "image/jpg")
        for (key, value) in parameters {
            multipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
        } 
   },to:"http://AddProjectUnitImages", headers: [ "Authorization":"Bearer \(String(describing: token))"]) { (result) in
   switch result {
   case .success(let upload, _, _):
       upload.uploadProgress(closure: { (progress) in
           print("Upload Progress: \(progress.fractionCompleted)")
        })

       upload.responseJSON { response in
          print(response.result.value)
       }
       case .failure(let encodingError):
          print(encodingError)
       }
     }
  }