Server Error in '/' Application.

The state information is invalid for this page and might be corrupted.

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: The state information is invalid for this page and might be corrupted.

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:


[FormatException: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. ]
   System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength) +14474273
   System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength) +131
   System.Convert.FromBase64String(String s) +50
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +86
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +65
   System.Web.UI.HiddenFieldPageStatePersister.Load() +179

[ViewStateException: Invalid viewstate. 
	Client IP: 34.200.248.66
	Port: 51374
	Referer: 
	Path: /HorseHistory.aspx
	User-Agent: claudebot
	ViewState: %2FwEPDwUKLTE1NzA4NzgyNWRkSlzPvB%2F4u4BeVROhYLMNHgISII12bOPW2ZDxf9V61wc%3D]

[HttpException (0x80004005): The state information is invalid for this page and might be corrupted.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +161
   System.Web.UI.HiddenFieldPageStatePersister.Load() +332
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +377
   System.Web.UI.Page.LoadAllState() +46
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +9318
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +355
   System.Web.UI.Page.ProcessRequest() +79
   System.Web.UI.Page.ProcessRequest(HttpContext context) +74
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +542
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +93


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