RazorRenderer cannot work well with .netfx 4.7.1

[cyciopes]

Hi, I was testing FluentEmail with RazorRender and .netfx 4.7.1, but is always reported exception. Am I missing something to get it worked well with .netfx 4.7.1?
My FluentEmail version was 2.7.0.
Btw, I also tried it with .net core 2.2, the RazorRenderer worked well with it.
Thanks in advance.

using FluentEmail.Core;
using FluentEmail.Smtp;
using FluentEmail.Razor;
using RazorLight.Razor;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;
using Xunit;

namespace GeneralTest
{
    public class FluntEmailTest
    {
        public FluntEmailTest()
        {
            Email.DefaultRenderer = new RazorRenderer();
        }

        [Fact]
        public void Test1()
        {
        }
    }
}

[bjcull]

Fixed by #186

This is still occuring in FluentEmail 3.0.0 with RazorLight 2.0.0-rc.3, even though it looks like that PR is closed. Is there a workaround?