Asp.Net 5/Core app.UseExceptionHandler() not working

I have in startup

(UPDATE: the solution was to move UseRouting under the /api/error routes)

app.UseRouting();

if (env.IsDevelopment()) {               
    app.UseExceptionHandler("/api/error/error-local-development"); 
    SwaggerConfig.Configure(app);              
}
else {             
    app.UseExceptionHandler("/api/error/error");
}

 app.UseCors();
 app.UseHttpsRedirection();
 app.UseDefaultFiles();
 app.UseSpaStaticFiles(); 
 app.UseAuthentication();
 app.UseAuthorization();
 app.UseRequestLocalization(options);
  app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
                endpoints.MapHub<ResultHub>("/hubs/resultHub");
            });


            app.UseSpa(spa =>
            {
                spa.Options.SourcePath = "wwwroot";
            });

But when throw new Exception() in a controller action, the Error controller Methods are never called.

[Route("api/error")]
[ApiController]
[ApiExplorerSettings(IgnoreApi = true)]
public class ErrorController : OwnBaseController
{
    public ErrorController(IApplicationUserService applicationUserService, ILogger<ErrorController> logger, IDiagnosticContext diagnosticContext) : base(applicationUserService, logger, diagnosticContext)
    {
    }

    [Route("error")]
    public IActionResult Error()
    {
        return Problem(); 
    }

    [Route("error-local-development")]
    public IActionResult ErrorLocalDevelopment([FromServices] IWebHostEnvironment webHostEnvironment)
    {
       var context = HttpContext.Features.Get<IExceptionHandlerFeature>();
       return Problem(
            detail: context.Error.StackTrace,
            title: context.Error.Message);
    }
}