Adding .Net Aspire to Existing Blazor Server App

I have a Blazor Server .Net 8 web application. I right-click on the Blazor sever project and select "Add" then ".Net Aspire Orchestrator Support".

This added the two Projects (AppHost, and Service Defaults) to my solution. The AppHost project is selected as the start-up project. When I run the app in Debug mode it fails and I am getting the below-attached error.

Any idea what is wrong? It seems it's trying to convert a string to a boolean.

When I debug my app normally without using Aspire, I use IIS Express in Visual Studio

If it helps this is the full error msg

System.Text.Json.JsonException  HResult=0x80131500  Message=The JSON value could not be converted to System.Nullable`1[System.Boolean]. Path: $.profiles.DptBlazor.dotnetRunMessages | LineNumber: 27 | BytePositionInLine: 33.  Source=System.Text.Json  StackTrace:   at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& state, Utf8JsonReader& reader, Exception ex)   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.ContinueDeserialize(ReadBufferState& bufferState, JsonReaderState& jsonReaderState, ReadStack& readStack)   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Deserialize(Stream utf8Json)   at Aspire.Hosting.LaunchProfileExtensions.GetLaunchSettings(IProjectMetadata projectMetadata)   at Aspire.Hosting.LaunchProfileExtensions.GetLaunchSettings(ProjectResource projectResource)   at Aspire.Hosting.LaunchProfileExtensions.TrySelectLaunchProfileFromEnvironment(ProjectResource projectResource, String& launchProfileName)   at Aspire.Hosting.LaunchProfileExtensions.SelectLaunchProfileName(ProjectResource projectResource)   at Aspire.Hosting.LaunchProfileExtensions.GetEffectiveLaunchProfile(ProjectResource projectResource, Boolean throwIfNotFound)   at Aspire.Hosting.ProjectResourceBuilderExtensions.WithProjectDefaults(IResourceBuilder`1 builder, Boolean excludeLaunchProfile, String launchProfileName)   at Aspire.Hosting.ProjectResourceBuilderExtensions.AddProject[TProject](IDistributedApplicationBuilder builder, String name)   at Program.<Main>$(String[] args) in C:\inetpub\wwwroot\MyApp\Dpt.AppHost\Program.cs:line 3  This exception was originally thrown at this call stack:    [External Code]Inner Exception 1:InvalidOperationException: Cannot get the value of a token type 'String' as a boolean.

Im using IIS Express when I run it without Aspire and it works fine. But when I try and use Aspire i get the error

My launchSettings.json is below, im using Windows Auth:

  {"iisSettings": {"windowsAuthentication": true,"anonymousAuthentication": false,"iis": {"applicationUrl": "http://localhost/DptBlazor","sslPort": 0    }  },"profiles": {"IIS Express": {"commandName": "IIS","launchBrowser": true,"environmentVariables": {"ASPNETCORE_ENVIRONMENT": "Development"      }    }  }}

After cleaning up launchSettings.son I got it to run a bit more, but now I get an odd error.