appium1.6.2 版本执行 ios 时,点击滑动扫描坐标按钮，报错 [performTouchAction([{"action":"press","options":{"x":197,"y":656}},{"action":"moveTo","options":{"x":197,"y":620}},{"action":"release","options":{}}])] Error response status: 13,UnknownError - An unknown server-side error occurred while processing the command. Selenium error: An unknown server-side error occurred while processing the command.Originalerror:Could not proxy command to remote server. Original error: Error: connect ECONNREFUSED 127.0.0.1:8100 请问大神是什么原因呢