Application will not start with NSwag in .net Core 2 - works fine with swashbuckle

After getting all of my client models working with NSwag (amazing tool BTW), I am trying to move my generation across to get the whole chain working with one system.

I have followed the wiki and this, essentially adding the NUGET packages and the Configure code; `
app.UseStaticFiles();

// Enable the Swagger UI middleware and the Swagger generator
app.UseSwaggerUi(typeof(Startup).GetTypeInfo().Assembly, settings =>
{
    settings.GeneratorSettings.DefaultPropertyNameHandling = PropertyNameHandling.CamelCase;
});`

Unfortunately my application starts, but then hangs trying to get the swagger.json. Any ideas on what I can try to figure out what is going on? It isn’t my .net core model because that works perfectly with my swashbuckle implementation - and yes, I did take the sb code out when implementing nswag.

Any help appreciated.

[statler]

It works with swagger 3 - so close away.

[RicoSuter]

Can we close this or should we investigate?