升级mac osx，npm报错

升级mac osx mavericks，npm报错误

sudo npm install express -g

node.js:810 var cwd = process.cwd(); ^ Error: EACCES, permission denied at Function.startup.resolveArgv0 (node.js:810:23) at startup (node.js:58:13) at node.js:901:3

执行其他npm就报这个错误，node 正常