Hi!
I Have the same problem. Could be a lot of things, like the policy meta tag on index and other thing that was my problem.
In index.html I added this:
<script src="/js/ng-cordova.min.js"></script>
the ng-cordova.min.js was copied manually to my js folder.
That's the mistake!
You should put this file into: lib/ngCordova/dist/ng-cordova.min.js
and in index.html must to be like that:
<script src="lib/ngCordova/dist/ng-cordova.min.js"></script>
Before
<script src="cordova.js"></script>
and after
<script src="lib/ionic/js/ionic.bundle.js"></script>
See this topic: https://github.com/driftyco/ng-cordova/issues/172
And look up for: "maikokuppe commented on 29 May"