For a site running on Ghost Pro, custom theme.
The message about @custom.comma_separated_list_of_cities and @custom.comma_separated_cities_for_front_page is a big lie. As you’ll see in the second image, I’m absolutely using them.
And from a custom partial:
I tried loading this theme into another Ghost Pro site, and got the same error, so although I originally suspected that perhaps the problem was that I was uploading a file with the same name as previously, I now have a clean install that gives the same error.
(EDIT: Went back and fixed a separate theme error, in case it was responsible for this erroneous error. Nope, but providing a clearer bug description above.)