help Lab1

All:
I am trying to use the Tiles- insert "header" 

******************************** layouts.xml looks like this:

<tiles-definitions>
	<definition name="baseDef"  template="/portlets/Layout.jsp">
		<put name="title"                 value="basicPortal com"/>
		<put name="logo"
value="/portlets/common/logo.jsp"/>
		<put name="header"
value="/portlets/common/header.jsp"/>
		<put name="leftBar"
value="/portlets/common/leftBar.jsp"/>
		<put name="body"                value="/index.jsp"/>
		<put name="adBar"
value="/portlets/common/adBarA.jsp"/>
		<put name="footer_left"
value="/portlets/common/footer_left.jsp"/>
		<put name="footer"
value="/portlets/common/footer.jsp"/>
		<put name="footer_right"
value="/portlets/common/footer_right.jsp"/>
		<put name="css"   value="/portlets/css/css.jsp"/>
	</definition>
	
	
<definition name=  "cmsList.pg"        extends ="baseDef">
            <put name= "body"
value="/portlets/CMSLst.jsp"/>
 </definition>




</tiles-definitions>

**********************************

java.lang.NullPointerException
	at
org.apache.struts.taglib.tiles.InsertTag.processAttribute(Ljava.lang.String;
)Lorg.apache.struts.taglib.tiles.InsertTag$TagHandler;(InsertTag.java:651)
	at
org.apache.struts.taglib.tiles.InsertTag.createTagHandler()Lorg.apache.strut
s.taglib.tiles.InsertTag$TagHandler;(InsertTag.java:483)

*******************************

Have you seen this problem before? Am i doing something wrong?

Thank you
Santhi