Tailwind config colors

I first make gray color and that is working, but I try to add orange and that not?!? Where I'm wrong

theme: {
        extend: {
            fontFamily: {
                sans: ['Nunito', ...defaultTheme.fontFamily.sans],
            },
        },
        colors: {
            // Build your palette here
            gray: colors.blueGray,   
            orange: colors.orange,  
        },
    },