I am new to GWT. I work with Eclipse and installed the needed plugins from teh google page http://code.google.com/intl/de/webtoolkit/usingeclipse.html I followed teh instructions and teh plugins installed properly. Then I created a project als descibed in teh above link.
Aftear reading sectioon "Deploy to App Engine" I created an application ID in google. THen in eclipse right click my gwt projet -> GOogle -> App Engine Settings..
I checked the "use Google App Engine" checkbox and tried to writ my Application ID. On the top of the message box I get teh error: "Cannot set application ID (appengine-web.xml is missing)"