from gtk import _gtk /usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: g_type_get_qdata: assertion 'node != NULL' failed from gtk import _gtk Segmentation fault (core dumped)

I freshly installed, on Ubuntu 14.04.2 LTS PyGUI.

So I wanted to test if it works by testing this example from the official documentation:
http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/version/Demos/BlobEdit/blobedit.py

Howver, I got this error:

begueradj@begueradj-darwin:~/Desktop$ python blobedit.py
/usr/lib/python2.7/dist-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed
  import gobject._gobject
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: specified class size for type 'PyGtkGenericCellRenderer' is smaller than the parent type's 'GtkCellRenderer' class size
  from gtk import _gtk
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: g_type_get_qdata: assertion 'node != NULL' failed
  from gtk import _gtk
Segmentation fault (core dumped)

What is the reason of this problem ?

Thank you in advance for any hints.

BEGUERADJ