E009 - Hex color format invalid

Cause

A color: value is not a hex color string in #RGB or #RRGGBB form. Named colors and other CSS color syntaxes are not accepted at this position.

Example

{ slides: [{ group: "demos", color: "red", slides: ["a"] }] }

How to fix

Use a 3- or 6-digit hex color: color: "#f00" or color: "#ff0000".