Server Error in '/' Application.

Unable to validate data.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Unable to validate data.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[HttpException (0x80004005): Unable to validate data.]
   System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean useValidationSymAlgo, Boolean useLegacyMode, IVType ivType, Boolean signData) +1067
   System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket) +307
   DotNetNuke.Services.Syndication.RssHttpHandlerHelper.ParseChannelQueryString(HttpRequest request, String& channelName, String& userName) +116
   DotNetNuke.Services.Syndication.RssHttpHandlerBase`3.System.Web.IHttpHandler.ProcessRequest(HttpContext context) +69
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +195
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +73


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0