Forum Error

System.Web.HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information. ---> System.Web.UI.ViewStateException: Invalid viewstate. 
	Client IP: 147.243.66.231
	Port: 50352
	Referer: https://forum.justyou.co.uk/
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36
	ViewState: 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...
   at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
   at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose)
   at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose)
   at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose)
   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.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   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.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   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.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.TaskAsyncHelper.EndTask(IAsyncResult ar)
   at System.Web.UI.Page.AsyncPageEndProcessRequest(IAsyncResult result)
   at ASP.default_aspx.EndProcessRequest(IAsyncResult ar)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.<>c__DisplayClass285_0.<ExecuteStepImpl>b__0()
   at System.Web.HttpApplication.StepInvoker.Invoke(Action executionStep)
   at System.Web.HttpApplication.StepInvoker.<>c__DisplayClass4_0.<Invoke>b__0()
   at Microsoft.AspNet.TelemetryCorrelation.TelemetryCorrelationHttpModule.OnExecuteRequestStep(HttpContextBase context, Action step)
   at System.Web.HttpApplication.<>c__DisplayClass284_0.<OnExecuteRequestStep>b__0(Action nextStepAction)
   at System.Web.HttpApplication.StepInvoker.Invoke(Action executionStep)
   at System.Web.HttpApplication.StepInvoker.<>c__DisplayClass4_0.<Invoke>b__0()
   at Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule.OnExecuteRequestStep(HttpContextBase context, Action step)
   at System.Web.HttpApplication.<>c__DisplayClass284_0.<OnExecuteRequestStep>b__0(Action nextStepAction)
   at System.Web.HttpApplication.StepInvoker.Invoke(Action executionStep)
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)