Error: cordova platform add android

D:\Varun\PhoneGap\cordovaApp\firstApp>cordova platform add android
Creating android project...
Error: cmd: Command failed with exit code ENOENT
    at ChildProcess.whenDone (C:\Documents and Settings\Administrator\Application Data\npm\node_modules\cordova\src\superspawn.js:112:23)
    at ChildProcess.EventEmitter.emit (events.js:95:17)
    at Process.ChildProcess._handle.onexit (child_process.js:795:12)