Error: $compile:ctreq Missing Required Controller

ionic-v1
1 
<ion-view title="Donate" hide-back-button="{{isApp}}" cache-view="false">
<ion-nav-buttons side="right" ng-if="user">
    <button ng-if="user_id" class="button button-icon button-clear ion-ios-search-strong right-search-icon" ui-sref="weCode.discover"></button>
</ion-nav-buttons></ion-view>

getting above error but the application working fine how do i overcome this error???