Could not retrieve value of component with path

Bonjour a tous,

Voila, je ne comprends cette erreur, je ne vois dans dans quel direction je peux chercher :

Code:

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javax.servlet.ServletException: javax.faces.FacesException: Could not retrieve value of component with path : {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /pages/typeunit/typeunit.jsp][Class: javax.faces.component.html.HtmlPanelGroup,Id: _idJsp0][Class: javax.faces.component.html.HtmlForm,Id: typeUnit][Class: org.apache.myfaces.component.html.ext.HtmlPanelGrid,Id: _idJsp2][Class: org.apache.myfaces.component.html.ext.HtmlPanelGroup,Id: _idJsp4][Class: javax.faces.component.html.HtmlOutputLabel,Id: tbTypeUnitId]}
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:154)
 
cause mere :
javax.faces.FacesException: javax.faces.FacesException: Could not retrieve value of component with path : {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /pages/typeunit/typeunit.jsp][Class: javax.faces.component.html.HtmlPanelGroup,Id: _idJsp0][Class: javax.faces.component.html.HtmlForm,Id: typeUnit][Class: org.apache.myfaces.component.html.ext.HtmlPanelGrid,Id: _idJsp2][Class: org.apache.myfaces.component.html.ext.HtmlPanelGroup,Id: _idJsp4][Class: javax.faces.component.html.HtmlOutputLabel,Id: tbTypeUnitId]}
	org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:425)
	org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:211)
	org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
	org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:132)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:140)

Serveur Tomcat 6.0
myfaces : 1.1

Pourriez-vous m'aider ?
Merci d'avance.

PS: je peux poste plus d'info sur demande.

Merci encore.