request for help because of error message while running my GWT application

I'm beginning with google web toolkit. while running my application, i
got this error message:
[ERROR] Unable to find 'com/google/gwt/sample/stockwatcher/
StockwatcherNew.gwt.xml' on your classpath; could be a typo, or maybe
you forgot to include a classpath entry for source?
[ERROR] shell failed in doStartup method

please i need your help to result it.

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