The Magpies lost their fourth consecutive league game on Saturday after they fell to a 3-2 defeat at Barnet, causing them to slump to 19th in the table.
"In the first half we were pretty pleased," Crossley told the Nottingham Post.
"We had two great chances to go 2-0 up and Vadaine (Oliver) said in the dressing room he has to score the two headers then the game is out of sight.
"We knew what we would get from Barnet but we didn't deal with it in the second half.
"The players are low in confidence and now it's about time they took some responsibility.
"We work through the week on strengths and weaknesses of the opposition and you can't legislate for miskicking the ball and making the wrong decisions.
"In the second half, that's what happened. They've got to dig themselves out of it. You can defend players, but they have got to show us what they are made of."
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