Swashbuckle 5 can’t find my ApiControllers

I got stuck.. and these answers didn’t help me fully… although they led me there. Just to save other people some time:

You have to pass the http config from OWIN and then register on that instead of using the GlobalConfiguration class like so:

//starup.cs
public void Configuration(IAppBuilder app)
    {
        Config = new HttpConfiguration();
        WebApiConfig.Register(Config);

        app
            .UseResponseLogging()
            .UseRequestLogging()
            .UseHttpErrors()
            .UseExceptionLogging()
            .UseWebApi(Config);

        HandlerConfig.Register(Config);

        SwaggerConfig.Register(Config);
    }

and in the swagger config file, change the register method to:

public static void Register(HttpConfiguration config)
    {
        var thisAssembly = typeof(SwaggerConfig).Assembly;

        config
            .EnableSwagger(c =>
                {...

Hope this helps.