Sir Alex Ferguson blamed 'inexplicable errors' for Manchester United's latest Premier League draw.
The Red Devils slumped to a third league stalemate and fourth from their last five games after throwing away a two-goal lead to draw 2-2 with West Bromwich Albion.
First-half goals from Javier Hernandez and Nani had put United in the driving seat.
However, a slightly fortuitous own goal following a deflection off Patrice Evra handed the Baggies a lifeline, before goalkeeper Edwin van der Sar's howler allowed the visitors to earn an unlikely share of the spoils.
"They got a real break for the first goal. I didn't think it was a foul. But they got the luck after that, it came off the inside of Evra's leg and it was just a bad bit of luck," Ferguson told MUTV.
"The second goal, what can you say? Edwin has been playing for over 20 years as a top goalkeeper and he was probably in primary school the last time he made a mistake like that.
"You just have to wipe it off the slate. There's nothing you can do about it, it was just one of these inexplicable errors."
Speaking about his side's inability to kill off teams so far this season, Ferguson continued: "Everton away should have been five or six, we should have got three or four at Fulham and we're losing points because of it.
"It's not a defining result in terms of where the league's going to end up, but we can't keep doing that. We are very frustrated about it.
"Two-nil is never a great scoreline. If you lose a goal, it gives the other team a lifeline. I always think 1-0 is better. It keeps the concentration better, you push more for the second goal."