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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.

If you see this error but you are not hosted in a cluster, you can resolve the problem by using the following line of code in your web.config file:

<system.web>
<pages enableViewStateMac="false" />
</system.web>