vaadin netbean's plugin using tomcat

I am installing netbean plugin. I am using a tomcat6 server.
I followed this tutorial

Everything seems to run fine until I run the default project.
It fails saying :
/home/bruce/vaadin/WebApplication1/nbproject/build-impl.xml:686: Problem: failed to create task or type nbdeploy
Cause: The name is undefined.

My tomcat run proberly and i can acess without problem to the http://localhost:8080/host-manager/html

Is it beceause I use netbeans 6.9?
What should I use to fix it?