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: 147.243.145.104
	Port: 42316
	Referer: https://forum.justyou.co.uk/
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
	ViewState: wIjKI3U7MWqon3tfnU0o1JhoeuSrn2LNNkNaG9Qi9b9B10ZEO9MdFvpcB/EHl+zgeIMkiHihPZv6I7dhIj8a5Bmlk8vhBT4MF5eKe3keGTd5sPN0V8lOQDIkDF6rDk9fvZN15mOPowguzo1Zb46R43EYvkA9836LgcRlGjoNkNLlCQebsMVDle+LQXqDyssPE1aS7b3Unu6oU6ZgzbCnI0tpO5LHSui4UzUL8oI9+XIH5jU2txBPc7txHXJ0eD59Mf/PPb6sWdZRnwSzzph/A0xUIh/7b3B8UjlOQLjdM2rHfW67z3BMsGMAox5rweke3l23gcFH1k+IwdSG2YmNX6fyxojuf59dzBhsJ9G1yXC7M80iFSYDm6lynqhDm5ZH6dTwHv5GsGt2ONAhPU2l/osC6LgKlBzfIB2C5ljptpEyfdVcmaghPVxlpCuiapvFmM2mJyYUGWrrsKrgoOZVaWWg4KmyTj2Mc/aMFqZioNw35n4lcWNf5QH2YKBCnRHFTFJ19Wf1KhYMg8I5DyFLNgE7kC9h/HHwowyC6FUxSfQw2udz2WbDAXDZJLx+1j380JEziUr8qYTZkEUNOL/sMdb7dn4H9VjWhsExpiTKTS6rImujKmtMCphEEFaL5o97xOzhoXJkD+XkJ+UaGpYEYdjVgtHMfknfm6tY6Nt+XnH484rILF7FY/yJpYdkTTj5iHQ/URTxCiwzFonLLdwYEhZaGmPHy4Dl+G4iEgmK69xNFyMIVKnuAA0mx+tgaiWGasSnZEmEe...
   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)