There are no colors on your Document color
Hello
I am getting this error while generating colors.
**"There are no colors on your Document color"**
![screen shot 2018-03-17 at 8 10 55 pm](https://user-images.githubusercontent.com/36441313/37557032-4c173baa-2a20-11e8-9cdb-0c9114ea74d2.png)

Even I am using colors. I don't know what happened. Please guide I have attached screenshot.
using latest Sketch 48.2 and macOS high Sierra.