Erro comum com facelets

é comum acontecer o erro:

javax.faces.FacesException: /pesquisa.jspx(6,47) Jsp:root: Mandatory attribute version missing
        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)

Adicione no faces-config.xml:

<application>

<locale-config>

<default-locale>pt_BR</default-locale>

</locale-config>

<view-handler>

com.sun.facelets.FaceletViewHandler

</view-handler>

</application>