Barry has told his team-mates they must learn from their mistakes.
He said: "It massively hurt in the dressing room when we were looking at the table.
"We don't want that feeling at the end of next season, so there are lessons to be learnt.
"You don't want to waste a year - like this year - without winning a trophy. But it can obviously be a step to appreciate what has to be done to retain a league title. It's quite clear the way we won it last year hurt United and it was their No 1 target to get their crown back.
"It's important we have that same attitude that we do want it back."