clean your sound layer from any effect or expression or keyframes.
or try to use a file in supported sound format like (mp3 or wav)
Hi Ricardo M,
Did you solve this issue?
Unless there is absolutely no other option (and you can always transcode audio) you should not be using MP3 audio in production. It's highly compressed, has a zillion variants, and is likely to foul up when encoded and re-compressed in a video render.
Other than that, the advice is good.