If you say about the Barcelona match that happened today in the Copa Del Rey, it means you didn't see the match today and try to see the results of the Barcelona match now so you won't make more mistakes next time. In La Liga Barcelona still leads in first place and in the Copa Del Rey today Barcelona won due to an own goal from a Real Madrid player.
We watched a fantastic match between two La Liga giants, expecting more goals, but shockingly, there was only one goal conceded in the game. Militao was attempting to defend the ball, so in my opinion we shouldn't hold him responsible for the own goal. Barcelona arrived to eliminate Real Madrid from the Copa del Rey competition, not to dominate the game. It was challenging for the madridistas because despite controlling every aspect of the field, they were unable to score. When he censored the area that Los Blancos attempted to saturate, Xavi Hernandez pulled a major prank on Carlo Ancelotti.
Well, usually in matches between the big teams the score is not large. A big score is usually between the "middles" like Betis, Rayo Vallecano, Sevilla, etc. The big teams are usually cautious because they know the price of a mistake and one small mistake is enough to get a goal. Basically, this time it was the same, although probably Militao had no choice.
In any case, this win is very necessary for Barcelona, after the defeat by Manchester and especially after the offensive defeat by Almeria.