[plugin addtoany] how to make w3 valid

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I keep getting faults from w3 validator :

document type does not allow element “ul” here; missing one of “object”, “applet”, “map”, “iframe”, “button”, “ins”, “del” start-tag
<ul class="addtoany_list"><li><a class="a2a_dd addtoany_share_save" href="htt…
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The 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 ““, “<span>”, or “<font>”).