problem with the audio player function

I just installed manticore on a Raspi PI3 and I just configured it. I wanted to test with the audioplayer function but nothing comes out

here's the log file line

23:12:08.797 [default:track] INFO c.m.a.AudioProcessor [AudioProcessor.java:84] playing file : /home/pi/walle/InMoov//system/sounds/startupsound.mp3  mode : queued trackId : 1584569528769001