Fix error Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster

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Fix error Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster aspx iis

Step 1: Find Web.config
Setp 2: add top

  <system.web>
  ......
<machineKey validationKey='62EDD0660BD576D7F875B211CE9C5F7CA6C5B5A71E55B94E565599E98A7A4A0211DDB6C11C5457F7D8405077318698C739FDB2F75BB5402FDCDC6967795891D5' decryptionKey='7FBEE09A657134C9408AD75BCCA5F0BCEFBA17242B8F61F1' validation='SHA1' />