WicketMessage: Markup does not contain a fragment with id=frag2;


		<div wicket:id="pane4">
			<span wicket:id="loginpanel"></span>
			<wicket:fragment wicket:id="frag2">
				<span wicket:id="feedback"></span>
			</wicket:fragment>
		</div>


code: 

		add(pane1 = new SocialDockablePane("pane4").setContainer(cont1).setTitle("test"));
		
		Fragment frag = new Fragment("loginpanel","frag2");
		frag.add(new FeedbackPanel("feedback"));
		//frag.add(new SigninStateless("signin"));
		pane1.add(frag);