Eric:
I played with this for some time, taking your advice. Nothing worked however I finally realized what was going on. Where the code reads “category=’category-slug'” I took it to mean that I would put first the category name then dash then slug name. I now understand that in fact it was only the slug that was intended in that space.
I thank you for your immediate attention and assistance. And I apologise for being a bit slow on the uptake!
