when trying npm install -D live-sever errors occur javascript

I always face troubles when i do npm install in my system. this time I am following javascript tutorial so he shows us to use the command npm install -D live-sever and it occurs errors. by the way im using internet behind proxy.

`npm ERR! code E404
 npm ERR! 404 Not Found - GET https://registry.npmjs.org/live-sever - Not found     
 npm ERR! 404
 npm ERR! 404  'live-sever@*' is not in this registry.
 npm ERR! 404 You should bug the author to publish it (or use the name yourself!)   
 npm ERR! 404
 npm ERR! 404 Note that you can also install from a
 npm ERR! 404 tarball, folder, http url, or git url.

>Solution :

The correct name is live-server:

npm install -D live-server