I am in Nelson BC and flew my Phantom 3Pro successfully in the school yard of a school. But today I was going to give a demonstration to a group of students and the phantom would not fly as it reported that I was in a NFZ. Checked the dji map of NFZ and there are none around Nelson BC. Whats up, does anyone know why it would suddenly think I was in a no fly zone when I was't? The school is about 1 km away from a small municipal airport but then again, I flew here last week no problem.