Forum Error

System.Web.HttpException (0x80004005): The state information is invalid for this page and might be corrupted. ---> System.Web.UI.ViewStateException: Invalid viewstate. 
	Client IP: 64.112.57.169
	Port: 33409
	Referer: 
	Path: /forum/default.aspx
	User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
	ViewState: 4BxzB/2Wt 3jLNfl6CDEM3wmccbtmAiN7J6efTUDbkCw UigWrWWyZj6/0A 6t7KD7Lxe0m r8pwne80/EZXal372arODMe9Km5QvdJglFHmFMkIMocavzTBi2Yg pJfAVhk/hGB/IVFAejMqk1VsFsj2UhxyLOdiztUu cnouYFovrd8EktA51BkpgLzsHdtHrOXOkML0RlDiMElO6BvzfpSbdUawsV8BPdu3mRKHaulwp4svezll70teax40FjUE YNoq20WpG1zshfMHgUwFHAvpGFGZ0zaQ/elg0MB1WrSKfP6krQR5HxpeKv/UzGh2gK9rrGtb5beK1miZu1Fv9w3 FwBcyDa8y0G9YzhljUgBLJ2XbIkwM6ydygHyoMLmryjewaM5uG11R0v2poyStDS5eohKUIIeTpQPpi/R Oa3OgwqFY5q8 4jlrOYV8Q63aE0YAHZx5SEmCmnav/YNOI qkM3GDlzLMpeGTjOnjOtreBCn1wfMBUn/dxP2pm 4KopGJhGrlETNjPwzkcRj4kUyDmFyMUnHxCBR/fmA3dkgomFMhKLrcdqc xDykge3XRA5EalGVGGcC/7Ro/xkiVeXEc4s8TrkZ4Mq TDdpE7Okp3ZJWAGM34C0pIDaaWQbCywNt6QmuxbAp4N6GNGXp1pOrJsjDR3uEtPDvaPn2rPPGC1u/WmWSKWDZswuFB5spVW9yf5RXvT04BHKUZXqrGEMJv8IeCESOMpZOLdOr2lhdliUH6y2apdXf1cEMcN67lQvCU27e71xcSN4SrecO... ---> System.FormatException: Invalid length for a Base-64 char array or string.
   at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
   at System.Convert.FromBase64String(String s)
   at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose)
   at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   --- End of inner exception stack trace ---
   at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
   at System.Web.UI.Page.LoadAllState()
   at System.Web.UI.Page.<ProcessRequestMainAsync>d__523.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Util.WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter.GetResult()
   at System.Web.UI.Page.<ProcessRequestAsync>d__515.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.UI.Page.<ProcessRequestAsync>d__554.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.TaskAsyncHelper.EndTask(IAsyncResult ar)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)