Running the Calc App

Being very new to Vaadin, I am just trying to get the basics going, so I am following the Book of Vaadin.

Anyway, after overcoming the “out of memory” problem last night (http://vaadin.com/forum/-/message_boards/message/162813), now I am getting this error from my Chrome browser when trying to run/debug the Calc app when launching from Eclipse…
“gwt module ‘com.vaadin.terminal.gwt.DefaultWidgetSet’ may need to be (re)compiled”. The page turns to gray, and then…nothing.

Anyone help? Thanks…