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: 147.243.145.106
	Port: 33022
	Referer: https://forum.justyou.co.uk/
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5042.0 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)