local audio files don't work as expected

[adamwong246]

I have run through the example without any problems. The audio sample https://revideo-example-assets.s3.amazonaws.com/chill-beat.mp3 is present in the editor and the exported file. But when I swap out that audio file for my own, the exported mp4 no longer has any audio. The audio is present in the editor, but not the exported file. The network tab shows a failed POST to "http://localhost:9000/audio-processing/generate-audio" which returned "Internal Server Error" in Hex.

// exported file has no audio
<Audio
      src="src/revideo/audio/problem.mp3"
      time={1}
      play={true}
    />

// works AOK
    // <Audio
    //   src={'https://revideo-example-assets.s3.amazonaws.com/chill-beat.mp3'}
    //   play={true}
    //   time={17.0}
    // />

[Dabugger]

theres an error in that, try to use .mp4 audio files