Cannot read property ‘plugins’ of undefined?

I installed ngCordova and included the js properly, I added the dependency too to my module, then I add clipboard plugin, then I do this code in my mainCtrl

  $cordovaClipboard
    .copy('text to copy')
    .then(function () {
      // success
      alert('copied');
    }, function () {
      // error
    });

I gotten the error of Cannot read property 'plugins' of undefined, I guess I've done everything correctly? What might me the cause, any idea guys? No clue here what's going on..