I am getting error while installing ionic using npm. Can someone please help me to solve this issue.

npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\JOY GHOSH\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "ionic"
npm ERR! node v4.4.7
npm ERR! npm  v3.10.5
npm ERR! code ELIFECYCLE

npm ERR! node-sass@3.8.0 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass@3.8.0 postinstall script 'node scripts/build.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the node-sass package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node scripts/build.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs node-sass
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls node-sass
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\Users\JOY GHOSH\npm-debug.log
npm ERR! code 1