Striker Robert Earnshaw netted his first Rams goal in Saturday's 4-1 FA Cup exit at the hands of Preston - but he'd rather be toasting a place in the last 16.
His strike, a neat finish from Gary Teale's through-ball, came nine minutes into the second half of the fourth-round clash.
But it proved to be a mere consolation as Preston were already three goals clear and went on to wrap up the game with a stoppage-time penalty.
"For me personally it was nice to get a goal but I would rather be in a winning team, or at least it be an equaliser so we can get back in the game," Earnshaw said.
"Mistakes cost us too much. Every game we make mistakes and every time we do that we concede goals.
"That's not good enough. We had a chat in the dressing room - that first half today shouldn't be happening."
Earnie admitted he couldn't put his finger on the Rams' problems - other than the errors.
"The main thing is individual mistakes but that is our season," he said.
"We have done it all season - basic things we should be doing as professionals but we're not doing.
"Ten-yard passes, keeping the ball, things like that we're doing in training but in games it's letting us down.
"We are not good enough in games and need to be a lot better."
He added: "Preston teams have always played good football and they played well today, you can't say they didn't, and they took their chances.
"But at the same time we should be cutting out the chances we gave them today.
"It shouldn't be happening. If they are going to score then it needs to be a great goal first of all.
"For us to then go on and concede four, it's just not good enough."
Earnshaw was thrown on at half-time with the damage already done by a Karl Hawley double and Simon Whaley's strike.
"Every time I come on I try and look sharp and lively, I try to do the best I can," he said.
"I was happy to ocme on at half-time because that gave me a whole half to try and do something.
"We did well for a lot of the half but we cannot finish a game by conceding a late goal and having a man sent off at the end.
"It's hard to talk about me and I don't want to when the team loses 4-1.
"It was heart-breaking and it frustrates you so much when you see the basic things like Preston passing the ball well, and we can't even do that.
"It was horrible to see."