Hi Justin,
I think the good doctor was suggesting you might want to rearrange your declaration thus:
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.yourclass{
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background:#fff url(../images/right-bg.gif) repeat-y right;
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}
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as the #fff in your declaration is the color.
I might also question what the 0 is intended to do. In the error message you related above, there is a 0 before the #fff. The background declaration can be used to specify color, image, repeat, position, and attachment (attachment is often omitted). Color is a hexadecimal or named css color; image is a url; repeat can be repeat-x, repeat-y, or no-repeat; position is top, bottom, left, right, or center; and attachment is often omitted, but can be set to fixed or scroll. I don't think a value of 0 is allowed for any of these. That could be your problem.
Best of luck, and happy coding!