Problems with vray blender

Hi friends of this amazing forum, i have the demo version for vray in blender and i am testing some things but i have two problems: 1- when i go to bake the texture, it presents a image very rare that is not true with the render, i don’t know what’s wrong


bake texture (i bake the blue prism)


2 - How can i render a scene with sun, because i tried render a scene with sun but i get a black render, i used vray materials and the result is the same

well that’s my two problems, thanks and regards