app.UseDeveloperExceptionPage(); not working

I have a clean ASP.Net Core Project but the middleware UseDeveloperExceptionPage() is not working at all,

If I request a non-existing url, the page is blank. :(

I have to add another middleware "app.UseStatusCodePages();" just to see the status error but isn't the UseDeveloperExceptionPage() shows a friendlier error status?

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseStatusCodePages(); //works fine
                app.UseExceptionHandler("/Home/Error") //<<---not working

                app.UseDatabaseErrorPage();
                app.UseBrowserLink();
                app.UseDeveloperExceptionPage(); //<<<---not working
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();

            app.UseIdentity();

            // Add external authentication middleware below. To configure them please see http://go.microsoft.com/fwlink/?LinkID=532715

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }

Environment is already set to "Development".

{"iisSettings": {"windowsAuthentication": false,"anonymousAuthentication": true,"iisExpress": {"applicationUrl": "http://localhost:56271/","sslPort": 0
    }
  },"profiles": {"IIS Express": {"commandName": "IISExpress","launchBrowser": true,"environmentVariables": {"ASPNETCORE_ENVIRONMENT": "Development"
        }
    },"CategoryProjectCore": {"commandName": "Project","launchBrowser": true,"launchUrl": "http://localhost:5000","environmentVariables": {"ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}