Validation Error of Class ?

Crest Christopher <[email protected]> Sun, 21 Dec 2014 11:22:58 -0500

Newsgroups	gmane.org.w3c.validator
Message-ID	<[email protected]>

  Hi, I don't understand what is meant by this error, from my 
understanding I'm not allowed multiple classes of clear ?

Line 773, Column 38: duplicate specification of attribute "CLASS"

<div class="floatwrap" class="clear">

You have specified an attribute more than once. Example: Using the 
"height" attribute twice on the same "img" tag.

Christopher