Receiving an Error from the Flickr feed file???

$(document).ready(function () {
  $('button').click(function (){
    $('button').removeClass('selected');
    $(this).addClass('selected');
    var flickrAPI = "http://api.flickr.com/services/feeds/photos_public.gne?dsjsonlocalback=?";
    var animal = $(this).text();
    var flickrOptions = {
      tags: animal,
      format: "json"
    };
    function displayPhotos(data) {
      var photoHTML = '<ul>';
      $.each(data.items, function(i, photo) {
        photoHTML += '<li> class="grid-25 tablet-grid-50">';
        photoHTML += '<a href= "' + photo.link + '" class="image">';
        photoHTML += '<img src= "' + photo.media.m + '"></a></li>';
      });
      photoHTML += '</ul>';
      $('#photos').hmtl(photoHTML);
    }
    $.getJSON(flickrAPI, flickrOptions, displayPhotos);
  });
});