The portal page builder required to execute this callable object is not ava

We have created a callable object in GP of type Portal Page or IView using the link

http://help.sap.com/saphelp_nw04s/helpdata/en/42/9304efa5061d6ae10000000a1553f6/content.htm

When we try execute the action from UWL, the following error it shows,

The portal page builder required to execute this callable object is not available.

Any idea about this error.