Goalkeeper Nicholls and defender Cameron were both culpable as Nahki Wells continued his hot streak against the Cobblers to seal victory for the hosts.
"We are talking about two very good young players who will go on to bigger and better things than League Two football," said Boothroyd. They have been magnificent for us.
"These things happen, but we will bounce back. We don't always win, but we always have a go. We have got beaten but we take it on the chin and move on and focus on a home game against York next Saturday.
"The two keepers kept their teams in it. There were two very physical teams out there and we knew this was going to be a difficult game. We know a lot about them and they know a lot about us.
"Bradford have performed brilliantly to defend their goal and Nahki Wells does brilliantly against us. He is certainly a player, who does very well for Bradford and I congratulate all who have turned this club around. Being from Bradford that pleases me, but not today.
"We have had two difficult away games at Cheltenham and here at Bradford lost them both - our results have not been good away from home."