Admob plugin in ng-cordova not working


The admob plugin in ng-cordova not working. i am trying to run in terminal the following error i am getting .please help . i want to implement ads in the controller only

ionic $ ^Csritejas-MacBook-Pro:adsample sriteja$
sritejas-MacBook-Pro:adsample sriteja$ cordova plugin add
Error: Registry returned 404 for GET on