WebDynpro Application as callable object in GP?

Hello,
I have created a WebDynpro application in NetWeaver Studio.I have to create a callable object of this application in GP.
This application is available in GP.I create a callable object of it, with an action, block process for this single object.(Since i cant test this callable object).
Once i generate url and acess it, it generates an error in browser saying:
"The page builder required to display this application UI inside the portal environment is not available".
Kindly help me solve this issue.
Thanks,
Sharath

Andre,
Thanks a lot for your how to guide.. it's really good!.. I've followed all your steps and I've created my WD DC. Everything works fine, the build is correctly made, but when I deploy the application the following error is getting throw:
Deployment aborted
URL to deploy : file:/C:/DOCUME1/MARIAM1/LOCALS1/Temp/temp62306bcp.compa001de.ear
Result
=> deployment aborted : file:/C:/DOCUME1/MARIAM1/LOCALS1/Temp/temp62306bcp.compa001de.ear
Aborted: development component 'pa001de'/'bcp.com'/'local'/'20070606173629'/'0':Caught exception during application deployment from SAP J2EE Engine's deploy service:java.rmi.RemoteException: Cannot deploy application bcp.com/pa001de.. Reason: Clusterwide exception: Failed to deploy application bcp.com/pa001de. Check causing exception for details (trace file). Hint: Are all referenced components deployed and available on the engine?; nested exception is: com.sap.engine.services.deploy.container.DeploymentException: Clusterwide exception: Failed to deploy application bcp.com/pa001de. Check causing exception for details (trace file). Hint: Are all referenced components deployed and available on the engine? (message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).REMEXC)
Deployment exception : The deployment of at least one item aborted
I think that the referenced components are not at the J2EE, but how can I check this or what do you think can be happening??
Regards and thanks a lot to all!
María Margarita Monteverde

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