Hello Yoong,
I apologize for the late response.
You are right, there are some error messages when you run the script but they can be ignored. Please make sure you ran the library script in the library window. Attached file contains the instructions to import the library file and link the schematic components to the library and generate a board netlist (ratsnest) with footprints.
If you still have issues, share the WEBENCH design with me at howard.chen@ti.com and I can process it for you.
(Please visit the site to view this file)