Category Slug not working?

Hi,

I’m trying to get the portfolios to show by category. I can do the normal two and three column portfolio showings, for some reason, the shortcode doesn’t work when I use the category one. Any help?

here’s the category shortcode i’m putting in: [rx_aeolus_three_cols category_slug=”film”]

Is there anything wrong with it?

https://www.ads-software.com/plugins/aeolus-creative-portfolio/