000038458 - Unable to load Silverlight pages, (error Configuration for instance INSTANCENAME was not found) in RSA Archer

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
    <System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
        <EventID>0</EventID>
        <Type>3</Type>
        <SubType Name="Error">0</SubType>
        <Level>2</Level>
        <TimeCreated SystemTime="2020-02-07T21:56:42.2852534Z" />
        <Source Name="Archer.Silverlight.WCF" />
        <Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" />
        <Execution ProcessName="w3wp" ProcessID="9388" ThreadID="52" />
        <AssemblyVersion>6.7.0.1184</AssemblyVersion>
        <Channel />
        <Computer>ALL</Computer>
    </System>
    <ApplicationData>
        <TraceData>
            <DataItem>
                <TraceRecord Severity="Error" xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord">
                    <TraceIdentifier>Archer.Silverlight.WCF</TraceIdentifier>
                    <UserId>2</UserId>
                    <LogReferenceId>020720-215642-2162</LogReferenceId>
                    <Description>Configuration for instance Archer was not found.
Parameter name: instanceName</Description>
                    <AppDomain>/LM/W3SVC/1/ROOT/RSAarcher-1-132255659109480594</AppDomain>
                    <Exception>
                        <ExceptionType>System.ArgumentException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
                        <Message>Configuration for instance Archer was not found.
Parameter name: instanceName</Message>
                        <Source>ArcherTech.Configuration.Provider.ConfigService</Source>
                        <StackTrace>   at ArcherTech.Configuration.Provider.ConfigService.ConfigServiceInstanceConfigurationProvider.GetInstanceProperties(String instanceName)
   at ArcherTech.Kernel.Aspects.AuditLoggingManagerAspect.LoggingEnabled(MethodExecutionArgs input)
   at ArcherTech.Kernel.Aspects.AuditLoggingManagerAspect.OnExit(MethodExecutionArgs input)
   at ArcherTech.Kernel.Managers.AppearanceThemeManager.GetActive(SessionContext sessionContext)
   at SyncInvokeGetActive(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&amp; rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</StackTrace>
                    </Exception>
                </TraceRecord>
            </DataItem>
        </TraceData>
    </ApplicationData>
</E2ETraceEvent>

1. Rename the Instance in the ACP, then save. 
2. Close the ACP, and restart all configuration services on all Archer servers.
3. Perform IISRESET