sap wsrp support (problem with registration)

hi buddies,

I am using SAPNetWeaver 2004s sp7. I am trying to integrate jsr portlet developed in IBMWebsphere into SAP Enterprise Portal. While registering with producer i am getting some error.

could not instantiate pane instance of type com.sapportals.admin.wizardframework.core.ClassNameAndConstructorArgs@dcf484##

can anybody please solve the problem

Regards

Vamsee