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The error messsage 'NoneType' object has no attribute 'set_volume' shows up

OS: Win10 64bit
PsychoPy version: 1.84.2
Standard Standalone: Y

I set up a psychopy experiement including sound components on the Builder interface,
however, only to fail to running it. I installed pygame, uninstalled pyo, and changed the order of
the audio library preference from pyo to pygame, but it doesn’t still work. The error message follows as:

Following is my psychopy experiment file:
test.psyexp (19.5 KB)

What should I do to make it work? Thank you in advance!

Are you trying to read mp3 files (it seems to in your test.psyexp file)? I don’t know about pygame but pyo does not support mp3 files (wav, aiff, flac, ogg, sd2, caf).


At first I used mp3 files, but changed the filename extention from mp3 to wav after realizing mp3 format is not supported. Thanks, Olivier.

Oh, converting the mp3 files to wav files using an audio converter, NOT just changing their file name extentions, worked! Thank you for your advice, Olivier!