Hi @prem0919!
I followed the steps mentioned here (which I think are similar to the blog that you sent), and it worked. I built it for BSP 6.
How did you set your Yocto environment? I recommend you follow the article about how to Build a Reference Image with Yocto Project/OpenEmbedded and, after that, follow the steps in the link above.
Best regards.
Lucas Azeituno.