Flags not showing in AdminLTE 2 theme?

[JonathanNet]

Hi I am using this nice selector, but the flags is not showing in the AdminLTE 2 theme, how do I fix that?

<div class="col-xs-3"> <label>Country:</label> <div class="input-group"> <span class="input-group-addon"><i class="fa fa-flag"></i></span> <select class="selectpicker countrypicker" data-flag="true" data-live-search="true"> </select> </div> </div>