Nottinghamshire's bowling attack was not good enough in the County Championship defeat against Somerset, says director of cricket Mick Newell.
Somerset scored 312 on a bowler-friendly surface in the first innings at Trent Bridge and Newell was furious.
"There has been some good bowling in large parts of the game, but unfortunately most of it was done by Somerset," told BBC Radio Nottingham.
Notts drew their first three games this season but have lost their last two.
"We are still trying to find our best bowling combination and that remains the challenge," Newell added.
"From 100-5, to allow Somerset to get to 300 has cost us the match."
Newell praised his bowlers' efforts in the second innings when they dismissed the visitors for 161 on a incredible third day that saw 22 wickets fall.
But he said the damage was done in the first innings.
"Our bowlers were terrific [in the second innings] but 300 is far too many on that pitch," Newell explained.
"We are in a strong division we know we have to play haven't played well this game and half of a game against Durham, but apart from that we have played some pretty decent cricket
"Our team has been exposed as not playing well enough to win the match so that is something we have to be more concerned about than anything else."