Show page 2 on page 1 pop up

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ASP.NET4

I have a set of filtering controls that helps me to filter my search. I need this to be poped up on a various pages in my site. I have developed this in a separate page called (filter.aspx) and implemented the requirements. Now I want this to be poped up in my other pages.

So, I used this way:

Say Home page.
<button id="myButton" role="button" class="btn nav-form" data-target="filter.aspx" data-toggle="modal">Show Popup</button>


This snippet of code popsup on my Home page. But when I click a server side control from filter.aspx page then an error thrown.

Look at the Error below:

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.

Can any one help me to resolve this problem?