Uncaught TypeError: Cannot read property 'className' of undefined, http://localhost:8100/lib/ionic-material/dist/ionic.material.min.js, Line: 13

when i try to load my html page i am getting an error in console. following is the html i am trying to load.

< ion-view view-title=“Gallery”>

  < ion-content ng-init="showProductsToLike()">
            < ion-item ng-repeat="product in products">
  < /ion-content>

< /ion-view>

I used Ionic-material to creating this App. So i added the ionic-material dependencies in my index.html
I don’t understand what’s this error saying even the specified js file ionic.material.min.js is added in the index.html