--- a/index.html	Wed Oct 12 12:51:04 2016 +0800
+++ b/index.html	Sat Oct 22 19:28:45 2016 +0800
@@ -149,7 +149,7 @@
                 }
               }
             }, function(xhr) {
-              console.log('fail');
+              console.error('Loading ' + url + ' failed: ' + xhr.statusText);
             });
           }
         });