Barcelona coach Xavi admitted relief after their Copa del Rey win at Barbastro.
Barca did just enough to win the tie 3-2 on Sunday.
Xavi later said: "We have suffered a little. We have done a very serious first half. They seemed doomed, but these games always get complicated. It has been more complicated than necessary for us.
"We are in the second round, which was the goal."
"It was a lack of concentration. It was a very controlled match. The badly disallowed goal... It is complicated by our mistakes.
"I didn't see it coming. We are giving away things. Precisely today their opportunities came from unnecessary fouls and set pieces. They take advantage of it. In fact, they beat Almera with a lateral foul.
"It didn't surprise me because against Almera they were very aggressive. With their goal from a corner they become very active. I wish the best to the team and the people of Barbastro, who have treated us very well."