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I tried running

sudo npm install -g express-generator
Password:

or

npm install -g express-generator

but both returned error

npm ERR! error rolling back Error: Refusing to delete: /usr/local/bin/express not in /usr/local/lib/node_modules/express-generator
npm ERR! error rolling back     at clobberFail (/usr/local/lib/node_modules/npm/lib/utils/gently-rm.js:57:12)
npm ERR! error rolling back     at next (/usr/local/lib/node_modules/npm/lib/utils/gently-rm.js:43:14)
npm ERR! error rolling back     at /usr/local/lib/node_modules/npm/lib/utils/gently-rm.js:52:12
npm ERR! error rolling back     at Object.oncomplete (evalmachine.<anonymous>:107:15)
npm ERR! error rolling back  [email protected] { [Error: Refusing to delete: /usr/local/bin/express not in /usr/local/lib/node_modules/express-generator] code: 'EEXIST', path: '/usr/local/bin/express' }
npm ERR! Refusing to delete: /usr/local/bin/express not in /usr/local/lib/node_modules/express-generator
File exists: /usr/local/bin/express
Move it away, and try again. 

npm ERR! System Darwin 12.2.0
npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "express-generator"
npm ERR! cwd /Users/path/
npm ERR! node -v v0.10.31
npm ERR! npm -v 1.4.23
npm ERR! path /usr/local/bin/express
npm ERR! code EEXIST
npm ERR! 
npm ERR! Additional logging details can be found in:

I am not sure what is the dependency relationship between express and express generator, so I am not sure if I want to delete

/usr/local/bin/express

Any help would be appreciated