No App Identifier is available

Trying to follow the instructions at http://code.google.com/webtoolkit/usingeclipse.html the last part, deploy to google app engine.

I am an absolute newbe to GWT.

Everything has worked fine up to here.  But I cannot get an application identifier.  Regardless of what i put in at https://appengine.google.com/start/createapp.do (got there by clicking on App Engine Administrative Console link in instructions above) in the Application Identifier field, it comes back and says that identifier is not available.  I have tried very long random strings of numbers, everything.  

So I am stuck.  Any ideas?

Thanks,

Bob 

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