Valeur de l'argument pageClass

Bonjour la liste,

Je débute avec wicket et j'utilise la version 1.4 sous l'environnement Eclipse. Le serveur web utilisé est Eclipse 3.4. Mais seulement lorsque je lance mon application ( menu contextuel sur le projet -> run as -> java application), j'ai cette erreur

Code:

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java.lang.IllegalArgumentException: Argument pageClass must be not null
	at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.<init>(BookmarkablePageRequestTarget.java:122)
	at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.<init>(BookmarkablePageRequestTarget.java:85)
	at org.apache.wicket.request.AbstractRequestCycleProcessor.resolveHomePageTarget(AbstractRequestCycleProcessor.java:335)
	at org.apache.wicket.protocol.http.WebRequestCycleProcessor.resolve(WebRequestCycleProcessor.java:168)
	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1252)
	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1370)
	at org.apache.wicket.RequestCycle.request(RequestCycle.java:501)
	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:455)
	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:288)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)
155028 [http-8080-1] ERROR org.apache.wicket.RequestCycle - Argument pageClass must be not null

Je ne comprends pourquoi?
Merci d'avance pour votre aide