Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

let path = Bundle.main.path(forResource: "countryData", ofType: "json")let url = URL(fileURLWithPath: path!)// 帶throws的方法需要拋異常 do {    /*     * try 和 try! 的區別     * try 發生異常會跳到catch代碼中     * try! 發生異常程序會直接crash     */   let data = try Data(contentsOf: url)   let jsonData:Any = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)   let jsonArr = jsonData as! NSArray      for dict in jsonArr {    print(dict)   }  } catch let error as Error! {   print("讀取本地數據出現錯誤!",error)  }