Vaadin designer - can`t create Design project

Hi
I am trying to play with Vaadin designer but stuck up at the beginning.
Environment:
-Eclips Juno and Luna both are having the same situation.
-Installed vaadin plugin
-installed vaadin designer
-JDK7, vaadin 7.4beta
-Tomcat 7

Problem:
After I have created a project, I tried to create vaadin desin. I hav eupdated the following info in th wizard:

package :\com\example\testproject
name testproject

When I click FINISH button, it doesn`t work.

Any help is appreciated.

The same issue is already being discussed in
https://vaadin.com/forum#!/thread/9019447