Steve Bruce has demanded his Hull side cut out the mistakes after their 3-1 defeat to lowly Peterborough.
Emile Sinclair's hat-trick earned the visitors their first points of the season as the Tigers paid for a string of costly errors.
"It was one of them awful games, we were punished for individual errors," said the Tigers boss.
"You can't make the mistakes we did, individual mistakes on the first and second. We were littered with bad ones," he said.
"We got back in it, we have them and then give them the third one where he runs through and scores. In the first half an hour, there was only one team in it but that's football.
"We gave them a lead to 1-0 and Ben Amos had his least busiest time of all. It spoils a really good team performance from us."