By Scott Trotter Furious Barcelona boss Xavi told referee Istvan Kovacs his decision to send off Ronald Araujo “was a disaster” as the La Liga side crashed out of the Champions League. The Uruguay international denied Bradley Barcola a goalscoring opportunity when he hauled him down just outside of the area after 29 minutes. Araujo’s errant pass instigated the move that eventually released the Paris Saint-Germain forward. The 25-year-old’s dismissal saw the beginning of an unbelievable meltdown from the Catalan giants, as Araujo initially refused to leave the pitch. From a position of comfort …