Validation of viewstate MAC failed

I have some problems with a site project im working on.

It should be easy, but im running into an error.

My page has a server sided form and client sided (basic html) textboxes, a
button and a simple jscript to submit the form to an other page.
Currently there are no asp.net controls on the page.

I have been looking on different forums and no solution to be found, it
seems te be a bug in the .NET framework.

When i submit the form i get this error;
Validation of viewstate MAC failed. If this application is hosted by a Web
Farm or cluster, ensure that <machineKey> configuration specifies the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster.

ASPX Page:


<form id="form1" runat="server">
<input id="Button1" type="button" value="button" onclick="Form_Submit()"
/><br />
<input name="Text1" id="Text1" type="text" /><br />
<input name="test2" id="Text2" type="text" /><br />
</form>


Java Script:
function Form_Submit()

{

document.forms[0].action = "test.aspx";

document.forms[0].submit();

}




.

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