Eclipse/GWT: Resolve the error ‘unable to find a module’

Problem:
When during the launch of an application on local Jetty server via Eclipse, there is the following error :

Loading modules
	de.toolforge.googlechartwrapper.googlechartwrapper
	[ERROR] Unable to find 'de/toolforge/googlechartwrapper/googlechartwrapper.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

Solution
In Eclipse

1. Run -> Run Configurations,
2. Select your application to deploy,
3. Go in Arguments tab,
4. Then you have to delete the bad module which, in our case, is ‘de.toolforge.googlechartwrapper.googlechartwrapper’