diff -upr mate-control-center/font-viewer/sushi-font-loader.c mate-control-center-test/font-viewer/sushi-font-loader.c
--- mate-control-center/font-viewer/sushi-font-loader.c	2015-08-30 14:20:23.501739471 +0200
+++ mate-control-center-test/font-viewer/sushi-font-loader.c	2015-08-30 14:10:57.707855000 +0200
@@ -87,10 +87,13 @@ create_face_from_contents (FontLoadJob *
                                  &retval);
 
   if (ft_error != 0) {
-    g_set_error_literal (error, G_IO_ERROR, 0,
-                         "Unable to read the font face file");
+    gchar *uri;
+    uri = g_file_get_uri (job->file);
+    g_set_error (error, G_IO_ERROR, 0,
+                 "Unable to read the font face file '%s'", uri);
     retval = NULL;
     g_free (job->face_contents);
+    g_free (uri);
   } else {
     *contents = job->face_contents;
   }
diff -upr mate-control-center/font-viewer/sushi-font-widget.c mate-control-center-test/font-viewer/sushi-font-widget.c
--- mate-control-center/font-viewer/sushi-font-widget.c	2015-08-30 14:20:16.141662952 +0200
+++ mate-control-center-test/font-viewer/sushi-font-widget.c	2015-08-30 14:14:40.146169000 +0200
@@ -37,6 +37,7 @@ enum {
 
 enum {
   LOADED,
+  ERROR,
   NUM_SIGNALS
 };
 
@@ -549,7 +550,7 @@ font_face_async_ready_cb (GObject *objec
                                        &error);
 
   if (error != NULL) {
-    /* FIXME: need to signal the error */
+    g_signal_emit (self, signals[ERROR], 0, error->message);
     g_print ("Can't load the font face: %s\n", error->message);
     g_error_free (error);
 
@@ -682,6 +683,13 @@ sushi_font_widget_class_init (SushiFontW
                   0, NULL, NULL,
                   g_cclosure_marshal_VOID__VOID,
                   G_TYPE_NONE, 0);
+  signals[ERROR] =
+    g_signal_new ("error",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_FIRST,
+                  0, NULL, NULL,
+                  g_cclosure_marshal_VOID__STRING,
+                  G_TYPE_NONE, 1, G_TYPE_STRING);
 
   g_object_class_install_properties (oclass, NUM_PROPERTIES, properties);
   g_type_class_add_private (klass, sizeof (SushiFontWidgetPrivate));
@@ -705,3 +713,9 @@ sushi_font_widget_get_ft_face (SushiFont
   return self->priv->face;
 }
 
+const gchar *
+sushi_font_widget_get_uri (SushiFontWidget *self)
+{
+  return self->priv->uri;
+}
+
diff -upr mate-control-center/font-viewer/sushi-font-widget.h mate-control-center-test/font-viewer/sushi-font-widget.h
--- mate-control-center/font-viewer/sushi-font-widget.h	2015-08-30 14:20:07.806576294 +0200
+++ mate-control-center-test/font-viewer/sushi-font-widget.h	2015-08-30 14:15:23.586620000 +0200
@@ -63,6 +63,8 @@ SushiFontWidget *sushi_font_widget_new (
 
 FT_Face sushi_font_widget_get_ft_face (SushiFontWidget *self);
 
+const gchar *sushi_font_widget_get_uri (SushiFontWidget *self);
+
 G_END_DECLS
 
 #endif /* __SUSHI_FONT_WIDGET_H__ */