Auto Complete Error

<md-autocomplete md-selected-item="itemdata"
md-items="item in ctrl.data"
md-item-text="item.value"

             md-search-text="ctrl.searchText"
             <md-item-template>
    <span>{{item.value}}</span>
  </md-item-template>
   <md-not-found>
          No matches found.
      </md-not-found>
     </md-autocomplete>

This is auto complete box i am using