node.js – 安装yeoman时出错

paulh16$npm install -g yo
npm http GET https://registry.npmjs.org/yo
npm http 304 https://registry.npmjs.org/yo
npm ERR! Error: EACCES,mkdir '/usr/local/lib/node_modules/yo'
npm ERR!  { [Error: EACCES,mkdir '/usr/local/lib/node_modules/yo']
npm ERR!   errno: 3,npm ERR!   code: 'EACCES',npm ERR!   path: '/usr/local/lib/node_modules/yo',npm ERR!   fstream_type: 'Directory',npm ERR!   fstream_path: '/usr/local/lib/node_modules/yo',npm ERR!   fstream_class: 'DirWriter',npm ERR!   fstream_stack: 
npm ERR!    [ '/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23',npm ERR!      '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53',npm ERR!      'Object.oncomplete (fs.js:107:15)' ] }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Sy@L_874_1@ Darwin 13.0.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "-g" "yo"
npm ERR! cwd /Users/paulh16/.rvm/lib
npm ERR! node -v v0.10.22
npm ERR! npm -v 1.3.14
npm ERR! path /usr/local/lib/node_modules/yo
npm ERR! fstream_path /usr/local/lib/node_modules/yo
npm ERR! fstream_type Directory
npm ERR! fstream_class DirWriter
npm ERR! code EACCES
npm ERR! errno 3
npm ERR! stack Error: EACCES,mkdir '/usr/local/lib/node_modules/yo'
npm ERR! fstream_stack /usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23
npm ERR! fstream_stack /usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53
npm ERR! fstream_stack Object.oncomplete (fs.js:107:15)
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/paulh16/.rvm/lib/npm-debug.log
npm ERR! not ok @R_496_6756@

我相信问题是bash在Ruby Version Manager中寻找npm,这是我最初安装node和npm的地方.但是,我从RVM中删除了这两个并从Node网站安装.我还调整了我的.bash_profile：

PS1="\u$"
export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/MysqL/bin:$PATH"
export DYLD_LIBRARY_PATH="/usr/local/MysqL/lib:$DYLD_LIBRARY_PATH"

if [ -f ~/.git-completion.bash ]; then
   source ~/.git-completion.bash
fi

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM$

我不明白为什么Yeoman安装失败了.