Missing Piece

Really? After all that? A missing piece? Come on IKEA, you make me kill my back, rub my hands raw, by screwing in each little screw, only to find out 2 hours into making this thing that you gave me two doors! Not one! Now I have to try and translate "no you blond headed fool, I do not need two doors, I need a back! No not my back, my back hurts though thanks for asking...My desk's back"!