Can't add plugins using `phonegap plugin add XXX`

I've installed phonegap version 3 using `npm install -g phonegap` and now i want to install plugins for the andriod app I installed node.js ``` C:\var\www\sexdiaries.co.uk\app>node -v v0.10.17 ``` Then Phonegapy ``` phonegap plugin add https://git-wip-us.apache.org/repos/asf/cordova-plugin-splashscreen.git ``` But this gives this error: ``` [error] 'plugin' is not a node C:\Users\Hutber\AppData\Roaming\npm\node_modules\phonegap\bin\phonegap.js command. See 'node C:\Users\Hutber\AppData\Roaming\npm\node_modules\phonegap\bin\phonegap.js help' ```