swagger theme nivo

Hi i am struggling to get the swagger nivo slider to operate, it just shows a revolving cog, i have followed the instruction to add a featured image by using a featured tag, i cant find much online about this problem so i was wondering if some kind person could help, i may be doing something wrong.

I am using wordpress 4.5.1 and im thinking that this may have some kind of compatability issue but im unsure