Resource Request activity in Workflow

IDM 4.0.1

I am trying to grant a user to a resource using ResourceRequest activity in workflow.
But i am getting some error while granting a resource.

My ResourceRequest activity property

Name : ResourceRequest
Resource :flowdata.getObject('Start/Internal_AD_New_User/ADGroupList')
Action :grant
Traget :'cn='+flowdata.get('Start/Internal_AD_New_User/UserName')

Error i am seeing in the server.log

2012-05-02 16:04:19,826 INFO [STDOUT] (pool-13-thread-4) ERROR [RBPM] [com.novell.soa.af.impl.LogEvent:logError] [Workflow_Error] Initiated by cn=admin,ou=Services,o=havigs, Error Message: Malformed DN: [[ADGroupList: null]] specified., Process ID: 1342613e6df4415daf1fb62e0d068306, Process Name: cn=ExternalADUserCreation,cn=RequestDefs,cn=AppCon fig,cn=UserApplication,cn=Havigs-DriverSet,ou=IDM,ou=Services,o=havigs:16, Activity: Activity, Recipient: cn=admin,ou=Services,o=havigs
2012-05-02 16:04:19,827 INFO [STDOUT] (pool-13-thread-4) 436228031 [pool-13-thread-4] ERROR com.novell.soa.af.impl.LogEvent - [Workflow_Error] Initiated by cn=admin,ou=Services,o=havigs, Error Message: Malformed DN: [[ADGroupList: null]] specified., Process ID: 1342613e6df4415daf1fb62e0d068306, Process Name: cn=ExternalADUserCreation,cn=RequestDefs,cn=AppCon fig,cn=UserApplication,cn=Havigs-DriverSet,ou=IDM,ou=Services,o=havigs:16, Activity: Activity, Recipient: cn=admin,ou=Services,o=havigs
2012-05-02 16:04:19,924 INFO [STDOUT] (http-10.10.58.138-8080-5) INFO [RBPM] [com.novell.pwdmgt.util.PasswordHelper:loginPortal] [Login_Success] CN=admin,OU=Services,O=havigs successfully logged in.


Any idea what it means and what would have gone wrong