cnpm install protocol error,怎么办?

vagrant@ubuntu-14:~/www/webpack$ sudo cnpm install css-loader style-loader
✖ Install fail! Error: EPROTO: protocol error, symlink '../../_css-selector-tokenizer@0.7.0@css-selector-tokenizer' -> '/home/vagrant/www/webpack/node_modules/_css-loader@0.28.4@css-loader/node_modules/css-selector-tokenizer'
Error: EPROTO: protocol error, symlink '../../_css-selector-tokenizer@0.7.0@css-selector-tokenizer' -> '/home/vagrant/www/webpack/node_modules/_css-loader@0.28.4@css-loader/node_modules/css-selector-tokenizer'
    at Error (native)
npminstall version: 3.0.1
npminstall args: /usr/bin/nodejs /usr/lib/node_modules/cnpm/node_modules/npminstall/bin/install.js --china --userconfig=/home/vagrant/.cnpmrc --disturl=https://npm.taobao.org/mirrors/node --registry=https://registry.npm.taobao.org css-loader style-loader
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