Renderer doesn't work?

[TheDrawingCoder-Gamer]

This doesn't work:

trace(Yaml.render(Yaml.parse(Assets.getText('assets/images/custom_chars/custom_chars.yaml'))));

This is the fille

{
  template: !!map {
    like: bf,
    icons: !!seq [0,1,24]
  }
}

Is something wrong with the file or the renderer?