What does a Parse Error mean in W3C CSS Validator?

Posted on 2009-02-21
Last Modified: 2012-06-27
This is the result I get when I try to validate my CSS

W3C CSS Validator results for (CSS level 2.1)
Sorry! We found the following errors (1)
41             Parse Error .01_behind { background-image: none; padding: 15px 10px 10px; }

What exactly is that error telling me?
Question by:Amanda Watson
    LVL 9

    Accepted Solution

    Class names should not begin with a number.
    LVL 9

    Assisted Solution

    to clarify, your class .01_behind needs to not start with a 01 :)

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