[Glade-users] custom widegets in python

[aleuser at inwind.it]

Hi all,
 I'm using glade 3.4.5 and I'd like to add my own python widget.
I'm 
following some tutorials (for example: http://www.pygtk.org/articles/custom-
widgets-glade/Custom_PyGTK_Widgets_in_Glade3-part-2.html ) but I always get 
this error:

(glade-3:8507): GladeUI-CRITICAL **: Unable to load module 
'pywidgets' from any search paths


How can I solve?

Thanks
Alessandro