I had exactly the same problem. After some debuging and testing I found out, 
that the portlet instances you are using on your page are invalid. This means 
portal.DefaultPortlet.DefaultPortletInstance
can't be found.

1. Check if everything is spelled correctly.
2. Check if you have defined the name of you portal correctly as "portal" 
inside of jboss-portlet.xml in you WEB-INF dir.

There is already an other thread about this issue: 
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=60694


I hope this helps.
schoetz

View the original post : 
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3868772#3868772

Reply to the post : 
http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3868772


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