Very recently I have made some changes on my application after uploaded it to the server I have found this error:

 

Unable to validate data at System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf, Byte[] modifier,
Int32 start, Int32 length, Int32& dataLength) at System.Web.UI.LosFormatter.Deserialize(String input) e

 

After doing some r&d got the answer. Hopefully this will helpful for you. 

http://aspboss.blogspot.com/2012/03/error-unable-to-validate-data.html

 

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