Does it work???

Am I doing something wrong? I have not had 1 ghost appear on here, we are in a 15 yr old house, 2nd owner, so is it possible we just have no ghosts? I got the app because I thought the house WAS haunted.. But Ive tried it SEVERAL times. Is there a trick? Secret? Or should I try somewhere else?

Savannah111210 about Ghost Observer - AR Detector, v1.4