Newbie with Vaadin and Eclipse

I am a newbie with vaadin. I am a java programmer but never used graphics environment, I programmed using pico and notepad, so using eclipse is so hard for me now.
I am trying to do the first example , I read the book of Vaadin, I did the first example, Click Me!, I was fine but when I tried to do the update to same example now I am getting the error

The requested resource is not available.

I dont where start to look for the error. I am so impresive about Vaadin but it is too hard not Java else the environment.

There is any information about the environment eclipse and Tomcat. Tomcat is installed

Sorry for inconvenience but if somebody can help me will be so appreciated



Check these links out:

I guess these could get you started.