A 39-year-old Morris County man engaged in sexually explicit online conversations with a boy in North Carolina, authorities alleged Thursday. Between December 2022 and January 2023, Brian J. Cariddi communicated online with the minor, showing his genitals, and asking the 9-year-old to send nude images back, the Morris County Prosecutor’s Office said Cariddi, of Hanover Township, is charged with attempting to produce child sex abuse material, endangering the welfare of a child and lewdness, the prosecutor’s office said. Authorities arrested Cariddi on March 8. He’s being held at the Morris Coun…