Parameter is incorrect in crystal report viewer c#

I am dynamically creating a crystal report. When I run the program and click on a button, I get "Parameter is incorrect" information box. How can I resolve this?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using CrystalDecisions.Windows.Forms;
using System.Collections;

namespace SupplyRequestAndInventoryManagementSystem
{
    public partial class Report : Form
    {
        ReportDocument l = new ReportDocument();

        connection con = new connection();
        MySqlDataAdapter adapter;
        MySqlCommand cmd = new MySqlCommand();
        MySqlDataReader reader;
        public Report()
        {
            InitializeComponent();
        }

        private void Report_Load(object sender, EventArgs e)
        {

        }

       

        private void btnGenerate_Click(object sender, EventArgs e)
        {
            Hashtable hTable = new Hashtable();
            ArrayList duplicateList = new ArrayList();
            int column = 0;
            string c = "SELECT ";
            ParameterFields paramFields;
            ParameterField paramField;
            ParameterDiscreteValue paramDis;

            paramFields = new ParameterFields();

            if (comboTable.SelectedIndex == 0)
            {
               

                //supplier
                if (checkBox1.Checked)
                {
                    column++;
                    c = c.Insert(c.Length, "Supp_SuppName as Column" + column.ToString());
                    paramField = new ParameterField();
                    paramField.Name = "col" + column.ToString();
                    paramDis = new ParameterDiscreteValue();
                    paramDis.Value = "Supplier";
                    paramField.CurrentValues.Add(paramDis);
                    paramFields.Add(paramField);
                }
                //Name
                if (checkBox2.Checked)
                {
                    column++;
                    if (c.Contains("Column"))
                    {
                        c = c.Insert(c.Length, ",");
                    }
                    c = c.Insert(c.Length, "Supp_ProdName as Column" + column.ToString());

                    paramField = new ParameterField();
                    paramField.Name = "col" + column.ToString();
                    paramDis = new ParameterDiscreteValue();
                    paramDis.Value = "Name";
                    paramField.CurrentValues.Add(paramDis);
                    paramFields.Add(paramField);

                }

                c += " FROM supply_record where Supply_type = 'Assets'";


                crystalReportViewer1.ParameterFieldInfo = paramFields;

                con.Open();

                MySqlDataAdapter sda = new MySqlDataAdapter(c, con.con);
                DataSet dat = new DataSet();
                sda.Fill(dat, "supply_record");

                l.Load("insert directory here");


                l.SetDataSource(dat);
                crystalReportViewer1.ReportSource = l;

                con.Close();
                for (int i = column; i < 2; i++)
                {
                    column++;
                    paramField = new ParameterField();
                    paramField.Name = "col" + column.ToString();
                    paramDis = new ParameterDiscreteValue();
                    paramDis.Value = "";
                    paramField.CurrentValues.Add(paramDis);
                    paramFields.Add(paramField);

                }
            }
       }
    }
}