npm install error darwin

I tried to run this code from the terminal: "npm install", but i received this error. how can i fix this? i tried this http://ift.tt/18205LH but seems doesn't works for my issue. thanks

npm install
npm WARN engineStrict Per-package engineStrict (found in package.json for gulp-concat)
npm WARN engineStrict won't be used in npm 3+. Use the config setting `engine-strict` instead.
npm WARN engineStrict Per-package engineStrict (found in package.json for gulp)
npm WARN engineStrict won't be used in npm 3+. Use the config setting `engine-strict` instead.
npm WARN engineStrict Per-package engineStrict (found in package.json for vinyl-fs)
npm WARN engineStrict won't be used in npm 3+. Use the config setting `engine-strict` instead.
npm ERR! Darwin 12.4.0
npm ERR! argv "node" "/usr/local/bin/npm" "install"
npm ERR! node v0.12.0
npm ERR! npm  v2.7.0

npm ERR! null == true