Ahh.. Okay, you're validating your webpage and it's looking at the total CSS. This is where the autoXml comes from... it's an inline style on the page.
The general error of "Same colors for color and background-color in two contexts" means that somewhere, you have the text color and the background color set to the same thing, for something. Thus your text would be invisible on the page. Like looking at white on white. You can't see it.
The "#autoXML" is the validator's poor way of telling you that a style actually on the page itself (and not in the CSS file) is causing this sort of thing to happen.
In particular, this is one of the problems in your webpage's code:
<span style="color:#8431bd">(press Ctrl+D)</span>
That color is the same as it's background, because the background is "body" which has this in it: "background : #8431bd;". That's what it's complaining about for one of those warnings. It's basically telling you that your text might be invisible.
Of course, the validator is not perfect. It can't tell that the actual background for that section is white, for example. Still, it's something to be aware of, basically. It's not often that you want the background of a big space (like body) to be the same as the foreground color of text on the page. Things get hidden too easily that way.