Xbmc

hi im not sure if im posting this in the right section i do apololigise if im not , i come across this XBMC , the problem is when after i have downloaded it and it asks if you want the box tick to start when finished download i get this grey box with the red circle and white cross saying error unable to create GUI. EXITING
does anyone know what that is if so any help would be very grateful thankyou .