Validation of viewstate MAC failed



To solve this you need to add a machinekey in web.config file

To generate a machine key please use the link below

http://developmentnow.com/asp-net-machinekey-generator/


To Generate a Unique Decryption Key for Each Application please use the link below

https://technet.microsoft.com/en-us/library/cc771837(v=ws.10).aspx


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