render view always black


I’m new to toon boom and just started learning. before writing this post I tried searching for solutions and nothing works.
my render view always black no matter how many layers and color cards i have, and no matter what color are my drawings.
I saw on youtube videos the render should show ok with my settings but it’s not the case…
I still can’t tell if it’s something I miss or is it a bug.
appreciate any help… Thanks !