HDRI button not active on my V-ray light gen window

After learning how to use v-ray light gen to render faster, i clicked on my light gen icon and it opened the light gen window. A message popped up saying “something went wrong while loading the content files…” i clicked continue and the HDRI tab was not active leaving only sunlight as light source option.

How can I correct that so i can work with HDRI for my lighting?