Проверяю сайт валидатором http://validator.w3.org, выдается одна ошибка -

Line 49, Column 120: document type does not allow element "input" here; missing one of "ins", "del", "h1", "h2", "h3", "h4", "h5", "h6", "p", "div", "address", "fieldset" start-tag
…d="__VIEWSTATE" value="/wEPDwUJNzA0MDIyMjgzZGQO96ysJP7aDtE9DjCt5z1djsDwMQ==" />
✉
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 "<a>", "<span>", or "<font>").

ничего не пойму, ведь эта строка создается автоматом, и я никак не могу на нее повлиять..
целиком строка так выглядит - <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNzA0MDIyMjgzZGQO96ysJP7aDtE9DjCt5z1djsDwMQ==" />
Кто что подскажет?