How to call ID Provider from workflow

I'm trying to call ID Provider from a workflow mapping activity. I created the policy and copied the idprovider.jar to /opt/novell/idm/jboss/common/lib. I used this code to call the idprovider:

(function () {
var tmp = new Packages.com.novell.idm.idprovider.IDClient.getNex tID("10.0.1.69","1099","exid","","");
return tmp.toString();
})();

I get ths error :

2012-03-06 16:32:42,187 INFO [STDOUT] (pool-13-thread-7) ERROR [RBPM] [com.novell.soa.af.impl.LogEvent:logError] [Workflow_Error] Initiated by uid=BL3,ou=BL,ou=Users,o=data, Error Message: Dataitem [MAP0] with expression [//Process ID

(function () {
var tmp = new Packages.com.novell.idm.idprovider.IDClient.getNex tID("10.0.1.69","1099","exid","","");
return tmp.toString();
})();] failed to evaluate., Process ID: 9096efeca9d94bb084463e689eaa0784, Process Name: cn=newUser,cn=RequestDefs,cn=AppConfig,cn=UserAppl ication,cn=Driver Set,o=system:1394, Activity: Activity9, Recipient: uid=BL3,ou=BL,ou=Users,o=data


Did I miss something?