[igraph] Import Error

[Lorenzo Isella]

Dear All,
I am running Ubuntu 9.10 (amd64 architecture) on one of my machines.
I installed the library and its bindings according to the procedure 
described at

https://launchpad.net/~igraph/+archive/ppa

However, when I try importing the igraph module I get this error


In [3]: import igraph
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

/home/lorenzo/<ipython console> in <module>()

/usr/lib/python2.6/dist-packages/igraph/__init__.py in <module>()
    28 """
    29
---> 30 from igraph.core import *
    31 from igraph.core import __version__, __build_date__
    32 from igraph.clustering import *

ImportError: /usr/lib/python2.6/dist-packages/igraph/core.so: undefined 
symbol: igraph_diameter_dijkstra


I do not know how to handle this or whether I did some mystake 
somewhere, so any help is appreciated.
Cheers

Lorenzo