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: 149.102.247.134
	Port: 50598
	Referer: 
	Path: /forum/Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36
	ViewState: 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... ---> System.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. 
   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)