No action instance for path /logoff could be created

[Hari Om]

I am working on a simple Logon Application.

I am able to Logon to my Logon application and when I click the Signout Link 
it gives me following errors wonder why:
-------------------------------------------------------------------------
HTTP Status 500 - No action instance for path /logoff could be created
-------------------------------------------------------------------------

I have defined Action Mappings for "logoff" in my struts.xml but still get 
this error. My struts.xml is:
-----------------------------------------------------------------------------
<struts-config>
   <form-beans>
	    <form-bean name="LogonForm" type="app.LogonForm" />
   </form-beans>

  <global-forwards type="org.apache.struts.action.ActionForward">
       <forward name="logoff" path="/logoff.do" />
       <forward name="logon" path="/logon.do" />
       <forward name="welcome" path="/welcome.do" />
   </global-forwards>
   <action-mappings type="org.apache.struts.action.ActionMapping">
	    <action path="/welcome" type="org.apache.struts.actions.ForwardAction" 
parameter="/pages/welcome.jsp" />
       <action path="/logon" type="org.apache.struts.actions.ForwardAction" 
parameter="/pages/logon.jsp" />
       <action path="/logonSubmit" type="app.LogonAction" name="LogonForm" 
scope="request" validate="true" input="/pages/logon.jsp">
           <forward name="success" path="/pages/welcome.jsp" />
       </action>
       <action path="/logoff" type="app.LogoffAction">
           <forward name="success" path="/pages/welcome.jsp" />
       </action>
   </action-mappings>
   <message-resources parameter="resources/application.properties" />
</struts-config>
-----------------------------------------------------------------------------

My second question is:
I try to submit the form without entering Username and password .....BUT I 
do not receive any errors which I have defined in APPLICATION.PROPERTIES as:
-------------------------------------------------------------------------
error.username.required=<LI>Username is required</LI>
error.password.required=<LI>Password is required</LI>
-------------------------------------------------------------------------

Any help on this is appreciated!

THANKS for your great book!

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