Texture is not baking correctly in Bake Mode: Vertex Colors

Hi,
I have done vertex paint for one of my models. After vertex paint, I baked the texture, but it spoiled the model. I followed the procedure in this video for baking. The result is below.


is there any other method to follow.

Thank You.
Regards,
Jung Lee.

I tried the same method on primitive shapes(cubes, cylinder) and a human model. For primitive shapes, it is working good. But on complex models it is not working properly.Anybody there to help, i had found the other tutorials also. The procedure is almost same, but i am not getting proper output. Am i missing anything? Below is the result of human model.