Unable to replace Parent View in Eclipse

Hi Experts

I'm trying to extend the Fiori PO Approval app in eclipse.

When I try to open the wizard to replace an existing view with my custom code, it gives me attached error.

I'm using eclipse Juno 4.2 with relevant plugins and Fiori toolkit installed (SAP Fiori Toolkit).

Request your help here in resolving this issue.

Regards

Rahul