我正在使用webdriverIO Mocha框架工作，我尝试了许多解决方案，但仍收到以下错误。所以帮我解决这个问题
[23:57:52]??COMMAND???? POST???? "/wd/hub/session" [23:57:52]??DATA????????????????{"desiredCapabilities":{"javascriptEnabled":true,"locationContextEnabled":true,"handlesAlerts":true,"rotatable":true,"browserName":"firefox","platform":"macOS
10.12","version":"latest","build":"MAC_CHROME","pageLoadStrategy":"normal","acceptSslCerts":true,"_":"2 more keys: [\"loggingPrefs\",\"requestOrigins\"]"}} ERROR: connect ECONNREFUSED 127.0.0.1:4444
selenium selenium-chromedriver selenium-webdriver webdriver-io