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我在OSX機器上運行appium。我已經安裝appium使用下面的命令npm install -g appium，我也安裝了npm install wd但我收到以下錯誤從終端運行appium。appium給TypeError：fn必須是一個函數錯誤
TypeError: fn must be a function
See
at Function.Promise.promisify (/usr/local/lib/node_modules/appium/node_modules/bluebird/js/main/promisify.js:268:15)
at Object.<anonymous> (lib/fs.js:48:13)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (/usr/local/lib/node_modules/appium/node_modules/appium-support/build/lib/tempdir.js:12:11)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (/usr/local/lib/node_modules/appium/node_modules/appium-support/build/index.js:11:19)
請讓我知道我該如何解決這個問題。