Cannot find message resources under key org.apache.struts.action.MESSAGE

My *struts.xml *__file has:
-

<message-resources parameter="ApplicationResources.properties" />----

My *web.xml *__file has:
-

action org.apache.struts.action.ActionServlet ]]>application</param-name>
<param-value>ApplicationResources</param-value>
</init-param>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts.xml</param-value>
</init-param>
</servlet>
-

I have 2 files:
ApplicationResources_en.properties and
*ApplicationResources_fr.properties *

These files are stored in *WEB-INF/classes *directory and is stored in CLASSPATH.

When I run my browser, I get following wonder why:
-

javax.servlet.ServletException: Cannot find message resources under key org.apache.struts.action.MESSAGE
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:471)

etc.....
-

Any hints etc on this....?

THANKS!