i can't install package from npm

when i run this "npm install ng2-intro --save" in terminal i get this error:
npm ERR! code E404
npm ERR! 404 Not Found: ng2-intro@latest

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Amin.M\AppData\Roaming\npm-cache\_logs\2019-01-30T11_08_20_706Z-debug.log