The problem with Barcelona's defense is that it is not as effective as it should be. The team has struggled to contain opponents and find goals, which has led to numerous losses throughout their recent seasons.

To address this issue, the club needs to make some tactical adjustments. One solution could be to adopt a more aggressive style of play, where the team focuses on creating space for their attackers and attacking from deep. This approach will allow the defenders to focus on defending rather than chasing after the ball.

Another option would be to strengthen the defensive line by signing top players like Lionel Messi and Xavi Hernandez. These players have been instrumental in helping Barcelona score goals and keep opponents at bay.

In addition to these tactical adjustments, the club also needs to work on improving the quality of its defensive setup. The team has relied heavily on its central midfielders, but they may need to adjust their position to better defend against opponents who prefer to attack from the backline.

Overall, while Barcelona's defense still faces challenges, adopting a more aggressive and strategic approach can help them improve their performance and achieve greater success on the field.