[igraph] : error plot graph

[patricia]

Hello

I need to plot some graphs, and am studying the igraph drawing module in Python.2.7 (Windows operating system). I tried to run a very simple example, which also is in igraph.org page and got the following error message:

g = Graph.Famous ('Zachary')

layout = g.layout ("kk")

plot (g, layout = layout)

Traceback (most recent call last):

  File "<pyshell # 5>", line 1, in <module>

    plot (g, layout = layout)

  File "C: \ Python27 \ lib \ site-packages \ igraph \ drawing \ __ init__.py", line 427, in plot

    result = Plot (target, bbox, background = "")

  File "C: \ Python27 \ lib \ site-packages \ igraph \ drawing \ __ init__.py", line 122, in __init__

    self._surface_was_created = not isinstance (target, cairo.Surface)

  File "C: \ Python27 \ lib \ site-packages \ igraph \ drawing \ utils.py", line 396, in __getattr__

    raise TypeError ("plotting not available")

TypeError: plotting not available

Why this error is happening? What should I do to fix it?

Thank you