Traceback (most recent call last):
  File "/usr/bin/jockey-gtk", line 384, in on_button_toggle_clicked
    self.update_tree_model()
  File "/usr/bin/jockey-gtk", line 275, in update_tree_model
    pixbuf = theme.load_icon(Gtk.STOCK_REFRESH, 16, Gtk.IconLookupFlags.USE_BUILTIN)
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 44, in function
    return info.invoke(*args)
GError: Icon 'gtk-refresh' not present in theme