A 33-year-old patient has acute blood loss: erythrocytes - 2,2 x 1012/l, Hb- 55 g/l, blood group is A(II)Rh+. Accidentally the patient got a transfusion of donor erythrocyte mass of AB(IV)Rh+ group. An hour later the patient became anxious, got abdominal and lumbar pain. Ps- 134 bpm, AP - 100/65 mm Hg, body temperature - 38,6°C. After catheterization of urinary bladder 12 ml/h of dark-brown urine were obtained. What complication is it?