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: 147.243.244.241
	Port: 34940
	Referer: https://forum.justyou.co.uk/
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 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)