Yoast SEO -> Category in title

Hi,

I have : DirectoryTheme Responsive

I’ve installed Yoast SEO plugin, but I can’t get the titles correctly.

In Titles&Metas->Post Types there’s a segment ‘Listing Manager’
When I put %%title%% %%sep%% in there the title of the listing, the separator and the sitename (why?) appear in the title.

But I’d like to have someting like
%%category%% > %%title%% %%sep%%
but the category is empty

My question is: How do i get the category name in the title?