Kevin Darch felt there was a sense of déjà vu on Tuesday night after Barnstaple Town suffered their third successive loss.
Barum went down 2-0 at home to Bristol Manor Farm thanks to goals in either half from Dean Stamp and Ben Bament.
The result leaves Richard Pears’ side 19th in the league on 11 points, and they have now gone four Southern League games without a win.
Darch said individual errors cost Town dearly once again.
“We were good with the ball, but let ourselves down without the ball,” he said.
“The last three games we’ve played basically top four sides, and we’ve fallen a little bit short in each one.
“We’re not a million miles away, but if we don’t eradicate these errors, it’s going to be hard to beat these teams to be honest.”
Darch is happy with Barum’s overall play, but has urged the players to eradicate mistakes quickly.
He said: “We’re a little off in some departments, but the problem is when we’re without the ball. It’s a concentration thing. We just let ourselves down.
“We’d be great for 20 minutes, then one of our players will switch off, and we’ll always end up chasing the game.
“We understand it’s a learning curve as a lot of these players are new to this league, but they’ve got to start learning quickly. The ability is there, but the top teams concentrate for 90 minutes, they don’t make mistakes against us.”
Barum will look to get back to winning ways this Saturday when they travel to Didcot Town.
Last time out, Didcot played out a 3-3 draw at Manor Farm, and are currently 10 in the table, one of four teams that are on 23 points.
Darch is expecting another tough test, but said they will travel to Oxfordshire in good spirits.
“Any away game is tough especially as it’s a long way. But we’re in good spirits because we’re not playing badly.
“With the ball we do really well but it’s the same old story. We’re got to make as few mistakes as we can, hope other teams start making mistakes and that we can capitalise on that.”