Problem to refer to cell

Exception from HRESULT: 0x800A03EC    at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)
   at Microsoft.Office.Interop.Excel.Range.set__Default(Object RowIndex, Object ColumnIndex, Object value)
   at WindowsFormsApplication2.Form1.menuItem5_Click(Object sender, EventArgs e) in c:\dp13\General Application\WindowsFormsApplication5\WindowsFormsApplication2\Form1.cs:line 120

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using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Office.Interop;
using Microsoft.Office.Interop.Excel;
using System.IO.Compression;
using System.Diagnostics;
using System.Text; // This was needed to make ASCIIEncoding function
using Excel = Microsoft.Office.Interop.Excel;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        ...
        private void menuItem5_Click(object sender, System.EventArgs e)
        {
            string File1;
            File1 = "C:/dp2/List0.txt";
            const string fileName = @"c:/dp2/List0.dat";

            int RowID = 0, ColID = 0;
            Stopwatch stopwatch = new Stopwatch();
            stopwatch.Start();

            try
            {
                OpenFileDialog openFileDialog1 = new OpenFileDialog();
                if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    //int rCnt = 0;
                    //int cCnt = 0;

                    var ExcelObj = new Excel.Application();
                    Excel.Workbook Book0 = ExcelObj.Workbooks.Open(openFileDialog1.FileName, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true);

                    Excel.Worksheet Worksheet0;
                    Worksheet0 = (Excel.Worksheet)Book0.Worksheets.Add();
                    //((Excel.Worksheet)Worksheet0).Visible = Excel.XlSheetVisibility.xlSheetHidden;

                    //Excel.Worksheet Worksheet0 = (Excel.Worksheet)Book0.Worksheets.get_Item(1);
                    //Excel.Range Range0 = Worksheet0.UsedRange;

                    foreach (Excel.Worksheet sheet in Book0.Worksheets)
                    {
                        Excel.Range usedRange = sheet.UsedRange;

                        RowID++; Worksheet0.Cells[RowID, 1] = "^^^^" + sheet.Name + "^^^^"; RowID++;

                        //Iterate the rows in the used range
                        foreach (Excel.Range row in usedRange.Rows)
                        {
                            RowID++;
                            //Do something with the row.

                            //Ex. Iterate through the row's data and put in a string array
                            String[] rowData = new String[row.Columns.Count];
                            //int i = 0, j = 0;

                            for (int i = 0; i < row.Columns.Count; i++)
                            //while (j <= 15)
                            {
                                rowData[i] = Convert.ToString(row.Cells[1, i + 1].Value2);
                                /*if (!string.IsNullOrEmpty(rowData[i]))
                                    j = 0;
                                else
                                    j++;*/

                                if (!string.IsNullOrEmpty(rowData[i]) && rowData[i].IndexOf("@") < 0)
                                //if (!string.IsNullOrEmpty(rowData[i]))
                                {
                                    ColID++;
                                    Worksheet0.Cells[RowID, ColID] = rowData[i];
                                    ...

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