vCenter Orchestrator v5.1 with vCloud Director v5.1

I am using vCenter Orchestrator v5.1 with vCloud v5.1 and I am trying to change the vApp Storage Profile at the point of Instantiation using the following code

var objVclInstantiateVAppTemplateParams;

objVclInstantiateVAppTemplateParams = new VclInstantiateVAppTemplateParams();

objVclInstantiateVAppTemplateParams["name"] = strVclVAppName;

objVclInstantiateVAppTemplateParams["description"] = "vCO Deployed vApp - " + fullname + " (" + username + ")";

objVclInstantiateVAppTemplateParams["source"] = objVclVAppTemplate.getReference();

objVclInstantiateVAppTemplateParams["vAppParent"] = objVclVdc.getReference();

objVclInstantiateVAppTemplateParams["isSourceDelete"] = false;

objVclInstantiateVAppTemplateParams["linkedClone"] = true;

objVclInstantiateVAppTemplateParams["deploy"] = false;

objVclInstantiateVAppTemplateParams["powerOn"] = false;

objVclInstantiateVAppTemplateParams["allEULAsAccepted"] = true;

objVclInstantiateVAppTemplateParams["instantiationParams"] = objVclInstantiationParams;

But I get an error message saying that "DefaultStorageProfileSection" is an un-supported Instantiation section.

Please can someone assist me inresolving this issue.