ABCPdf unable to find type or namespace PDFTable

Question

I am using ABCPdf to insert Table of contents on the first page in my .NET Core 3.1 project. Compiler is unable to find PDFTable class as mentioned here in documentation.

Sample code below:

using System;
using System.IO;
using WebSupergoo.ABCpdf12;

namespace AddTableOfContents
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            Doc doc = new Doc();
            doc.FontSize = 96;
            doc.AddText("Hello World");
            doc.Save("simple.pdf");
            PDFTable theTable = new PDFTable(doc, 5); //error here

        }
}

Error: The type or namespace PDFTable could not be found