Nested view in IONIC

hi,

first i will code nested views very different of what you did

but i don't now what u goal...

so for easy fix
just change the name of nav view to tab-dash

.state('tab.chats', {
  url: '/chats',
  views: {
  **  'tab-dash': {**
      templateUrl: 'tab-chats.html',
      controller: 'ChatsCtrl'
    }
  }
})