我正在尝试使用node.js安装mutler模块来上传文件 这是我在尝试安装mutler时遇到的错误：
karans-MBP:artink Karan$ sudo npm install mutler --save
npm ERR! Darwin 15.0.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "mutler" "--save"
npm ERR! node v4.4.7
npm ERR! npm v3.10.7
npm ERR! code E404
npm ERR! 404 Registry returned 404 for GET on https://registry.npmjs.org/mutler
npm ERR! 404
npm ERR! 404 'mutler' is not in the npm registry.
npm ERR! 404 You should bug the author to publish it (or use the name yourself!)
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/Karan/artink/npm-debug.log
我尝试过在stackoverflow上发布的各种解决方案，但似乎没有任何效果。