I faced a problem with CKEDITOR and required field validator. Strange problem! When I left blank the textarea(CKEDITOR) required field validate it properly. But when I filled up textarea still now required field validator showed error message for entering data.


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. 

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