Cornish Pirates coach Gavin Cattle says he and his side are frustrated by the errors they made as they lost 28-17 at Ealing in the Championship.
The Pirates have lost three of their opening four games and are fourth-from-bottom of the table.
"I'm really disappointed," Cattle told BBC Radio Cornwall.
"Towards the end we got in areas of the pitch where we'd expect to score, but it was either a set-piece error or a basic handling error."
The Pirates have lost their last three matches, having beaten Nottingham on the opening day of the season.
"We're devastated with the loss and all we can do is pull tighter," added Cattle.
"Is it all doom and gloom? Some people look at results, it's a results-based business, but we started the game very well and scored a try against the run of play, but those crucial momentum swings we didn't take advantage of."
Cattle wants his players to work on their mistakes and improve ahead of their next game against Yorkshire Carnegie.
"We can't hope for wins and hope something will change, we have to do something about it," he said.
"We've got a trustworthy group and all we can do is work harder.
"We need to learn from those moments of the game and execute under pressure."