PyGIWarning: GMenu was imported without specifying a version first.

I tried to start menulibre from terminal because of the segfault from menu.
And this is the output i've got.

menulibre
sys:1: PyGIWarning: GMenu was imported without specifying a version first. Use gi.require_version('GMenu', '3.0') before import to ensure that the right version gets loaded.
No menu prefix found, MenuLibre will not function properly.
WARNING:menulibre: getDefaultMenuPrefix() 'No menu prefix found, MenuLibre will not function properly.'
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/menulibre/MenulibreApplication.py", line 1717, in do_activate
    self.win = MenulibreWindow(self)
  File "/usr/lib/python3.5/site-packages/menulibre/MenulibreApplication.py", line 207, in __init__
    self.configure_application_treeview(builder)
  File "/usr/lib/python3.5/site-packages/menulibre/MenulibreApplication.py", line 462, in configure_application_treeview
    self.treeview = MenulibreTreeview.Treeview(self, builder)
  File "/usr/lib/python3.5/site-packages/menulibre/MenulibreTreeview.py", line 43, in __init__
    self._configure_treeview(builder)
  File "/usr/lib/python3.5/site-packages/menulibre/MenulibreTreeview.py", line 54, in _configure_treeview
    treestore = MenuEditor.get_treestore()
  File "/usr/lib/python3.5/site-packages/menulibre/MenuEditor.py", line 113, in get_treestore
    menu = get_menus()[0]
  File "/usr/lib/python3.5/site-packages/menulibre/MenuEditor.py", line 175, in get_menus
    menu = MenuEditor()
  File "/usr/lib/python3.5/site-packages/menulibre/MenuEditor.py", line 227, in __init__
    self.load()
  File "/usr/lib/python3.5/site-packages/menulibre/MenuEditor.py", line 245, in load
    if not self.tree.load_sync():
GLib.Error: g-io-error-quark: Failed to look up menu_file for "applications.menu"
 (0)

I use arch linux and latest menulibre.
thanks