Problema com validação

<div id="busca"> <form action="" method="post"> <label for="campobusca">Busca <input id="campobusca" class="inputtexto" type="text" tabindex="1" /> </label> <input type="image" src="" /> </form> </div>

O que tem de errado com este código?

Ele da o seguinte erro qdo eu valido no w3c:

Error Line 56 column 29: document type does not allow element "label" here; missing one of "p", "h1", "h2", "h3", "h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del" start-tag. <label for="campobusca">Busca<input id="campobusca" class="inputtexto" typThe mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").

O DOC TYPE ta definido certinho e tudo, (XHTML Strict 1.0)