I can't get the routing by api version to work (web api, old style asp startup class)

[ofirgeller]

I'm following the basic web api example but getting an AmbiguousMatchException when making a request.

Since the example is for the new top level asp setup and I have the older startup + program file setup I had to adapt a bit,

            services.AddApiVersioning(options =>
                {
                    options.DefaultApiVersion = new ApiVersion(1);
                    options.ReportApiVersions = true;
                    options.AssumeDefaultVersionWhenUnspecified = true;
                    options.ApiVersionReader = ApiVersionReader.Combine(
                        new UrlSegmentApiVersionReader(),
                        new HeaderApiVersionReader("X-Api-Version"),
                        new QueryStringApiVersionReader());
                }).AddMvc();

inside ConfigureServices.

any ideas on what I might be doing wrong?