Anonymous - 2011-10-05

Hallo,
I'm trying to use Choco with CP-Viz, when I run the sample the class create the 3 XML files, but the Tree.xml file is empty:

<?xml version="1.0" encoding="UTF-8"?>
<!- choco-solver ->
<tree version="1.0" >
</tree>

and when I run

java ie.ucc.cccc.viz.Viz configuration.xml tree.xml visualization.xml

I got a nullpointerexception. Any ideas??
THanks in advance