A Nyack man was arrested last week after he was allegedly busted in an online sting of sexual predators. Rockland County D-A Tom Walsh says 66 year-old Robert Fidler faces four counts related to an undercover operation by a D-A task force, in which an officer posed as 13- and 14 year-old girls. Walsh says the officer earlier this year chatted with Fidler for several months, and he tried to arrange meetings for sex with the officer. He was arraigned in Ramapo Justice Court on Wednesday, no word on when he’s due back in court.