error installing github npm

I installed npm and I configured my proxy after that when I try to install any library eg git hub, it appears these errors:

npm ERR! node v6.11.3
npm ERR! npm  v3.10.10
npm ERR! code HPE_INVALID_CONSTANT
npm ERR! Parse Error

Based on a configuration tutorial:

  

npm config set proxy link

in local network (lan) settings (in my windowns) address: plimbr.com.br door: 8080 and my user and network password is p454647 password 12345

My configuration from this information put it like this:

npm config set proxy link