[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: 44.200.23.133
Port: 58020
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
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