Theme customizer not working with Zuki 

hello!
I have a problem with customizing the zuki theme. When I go to Appearances > Customise, the page is blank, no options shows.

Is there a solution to this issue (and if not, is there a way I can change my logo, background… Without using the theme customizer?)
Thanks a lot

Claire

Website is : http://www.30ansoupresque.com