Showing all my posts?

I have installed this plugin and am using childishly simple child theme
I’ve included this code in the text screen of a page:
[posts-for-page cat_slug=’club-galas′]

I definitely have a category club-galas but when I view the page it shows posts for all the categories not just that one?

Anyone any ideas?
Thanks
Tony

http://wordpress.org/plugins/posts-for-page/