Error while merging audio and video

[Kaitoxic]

Version information

• fluent-ffmpeg version: latest
• ffmpeg version:
• OS: Windows 11

Code to reproduce

new ffmpeg()
    .addInput("/src/bg.mp4")
    .addInput("./file.mp3")
    .saveToFile("/src/", "./temp");

(note: if the problem only happens with some inputs, include a link to such an input file)

Expected results

A file with my audio and my video 2 in 1

Observed results

I have this error when I want to merge a mp3 with a mp4