Text Formatting ⇒ Why definecolor failed?

[ymwork]

I write below

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\definecolor {darkblue}{rgb}{0.3,0.5,0.8}

But get compilation information

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! Undefined control sequence.
l.57 \definecolor
{darkblue}{rgb}{0.3,0.5,0.8}
? 

Why?

[Stefan Kottwitz]

Hi,

welcome to the forum!

You need to load the color package, or even better, the xcolor package with extended color support:

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\usepackage{xcolor}

Stefan