Ionic - Button Not Being Rendered In Android Emulator

I have simple app like:

<body ng-app="starter" ng-controller="MainController">
  <ion-header-bar class="bar-stable">
    <h1 class="title">Ionic Blank Starter</h1>
  </ion-header-bar>
  <ion-content>
    <div class="card">
        <div class="item item-text-wrap">
            {{result}}
        </div>
    </div>
    <button ng-click="getresult()" class="button button-block button-primary">Click</button>
  </ion-content>
</body>

When I emulate the app ionic emulate android the card is rendered as expected but the button is just static. It is not clickable and thus no click animation that comes with it. Any suggestion as to what might cause a simple button to not render properly?