Warning: none is not a known color

[danajanezic]

I keep getting this when I run rake diagram:, which then means that the background color in the svg's is black or when I convert to a png transparent. Is there a reason the background color isn't set to white?

[preston]

Yes -- it's a common use case to render the output over non-white backgrounds, such as on web pages or in other documents. I'm not getting this error.. could you provide details on how to reproduce?