Error: No mapping exists from object type

Here is the code for my simple parsing application. I am getting an error that states 'No mapping exists from type System.Text.RegularExpressions.Match to a known managed provider native type'. This started to occur when I switched from using Split('_') to RegEx.Match for defining RNumberE, RNumberD, etc. Any guidance is appreciated.

using System; 
using System.Data; 
using System.Data.SQLite; 
using System.IO;
using System.Text.RegularExpressions;
using System.Threading;
using System.Collections.Generic;
using System.Linq;
using System.Data.SqlClient;


namespace CMMDataParser 
{ 
    internal class Program 
    {


        public static List<string> GetImportedFileList()
        {
            List<string> ImportedFiles = new List<string>();
            using (SqlConnection connect = new SqlConnection(@"Server=SERVER;Database=RX_CMMData;Integrated Security=YES"))
            {
                connect.Open();
                using (SqlCommand fmd = connect.CreateCommand())
                {

                    fmd.CommandText = @"SELECT FileName FROM CMMData;";
                    fmd.CommandType = CommandType.Text;
                    SqlDataReader r = fmd.ExecuteReader();
                    while (r.Read())
                    {
                        ImportedFiles.Add(Convert.ToString(r["FileName"]));

                    }
                }
            }
            return ImportedFiles;
        } 




        private static void Main(string[] args) 
        {


            Console.Title = "John Deere CMM Data Parser";
            Console.WriteLine("Preparing CMM Data Parser... done");
            Console.WriteLine("Scanning for new CMM data...");
            Console.ForegroundColor = ConsoleColor.Gray;

            using (SqlConnection con = new SqlConnection(@"Server=FRXSQLDEV;Database=RX_CMMData;Integrated Security=YES"))
            {


                con.Open();

                using (SqlCommand insertCommand = con.