Невозможно привести COM-объект типа "Microsoft.Office.Interop.Word.Applicati­onClass" к интерфейсному типу

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Word = Microsoft.Office.Interop.Word;
//using Xceed.Word.NET;
using Microsoft.Office.Interop.Word;
using System.Runtime.InteropServices;
 
namespace Project1
{    
    public partial class Form1 : Form
    {
        //private readonly string TemplateFileName = @"D:for_dip.docx";
        private readonly string FileName = @"D:\for_dip1.docx";
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            var dzs = label1.Text;
            Microsoft.Office.Interop.Word.Application wordApplication = null;
            try
            {
                wordApplication = new Microsoft.Office.Interop.Word.Application();
                var document = wordApplication.Documents.Open(@"D:\for_dip.docx");
 
                var paragraph = document.Paragraphs.Add();
                paragraph.Range.Text = "This is a sample text to demonstrate how Interop works...";
                wordApplication.ActiveDocument.SaveAs(FileName, WdSaveFormat.wdFormatDocument);
            }
            finally
            {
                if (wordApplication != null)
                {
                    wordApplication.Quit();
                    Marshal.FinalReleaseComObject(wordApplication);
                }
            }
           
    
    }
}

var document = wordApplication.Documents.Open(@"D:\for_dip.docx");