Repeater Fails to load

Data.json

{
  "blog_name": "test",
  "id": 0,
  "post_url": "",
  "type": "text",
  "date": "2011-02-25 20:27:00 GMT",
  "timestamp": 1298665620,
  "state": "published",
  "format": "html",
  "reblog_key": "",
  "tags": [
     "tumblrize",
     "milky dog",
     "mini comic"
  ],
  "note_count": 14,
  "title": "Test",
  "body": "SomeThing"
}

Delegate.qml

ListItem{
  Repeater{
      id: tagRepeater
      model: tags
      Label{
          text: modelData
          color: Theme.secondaryColor
      }
  }
}

Listview.qml

SilicaListView {
    id: dashListView
    model: ListModel{
        id: dashModel
    }
    anchors.fill: parent
    delegate: PostDelegate{}
}

function append(element){
    dashListView.model.append(element)
}