i am passing 9 values to mysql storedprocedure but error is expected 9 and got 6 what is the problem, i am using sqltransactions?

oInvInvoiceLineItems.CustomerID = ddlCustomerName.SelectedValue;
        oInvInvoiceLineItems.InvoiceID = Convert.ToInt32(txtCusInvNumber.Text);

        DataSet local_ds = null;
        string local_strStoredProcName;
        int count = 0;
        local_ds = new DataSet();
        oInvHeader.CustomerID = ddlCustomerName.SelectedValue;
        oInvHeader.InvoiceID = Convert.ToInt32(txtCusInvNumber.Text);
        oInvHeader.Flag = "N";
        local_strStoredProcName = "uspInvoiceFedTaxID";
        oInvInvoiceLineItems.Select(out local_ds, local_strStoredProcName, ddlCustomerName.SelectedValue);
        oInvHeader.FedTaxID = local_ds.Tables[0].Rows[0]["FedTaxID"].ToString();
        oInvHeader.PaymentDate = DateTime.Now;`if (txtMemo.Text != string.Empty)
    {
        oInvHeader.Memo = txtMemo.Text;
    }
    else
    {
        oInvHeader.Memo = "Null";
    }
    oInvHeader.DueDate = DateTime.Now;

oInvHeader.Amount = Amount;

        oInvInvoiceLineItems.TotalAmount = Amount; 

        MySqlTransaction oSqlTrans = null;

if (customer != null)

        {

            oInvInvoiceLineItems.Update(count, oSqlTrans);

        }

        else

        {

            oInvHeader.Add(oInvInvoiceLineItems, count, oSqlTrans);

        }`    

public bool Add(InvInvoiceLineItems oInvoiceLineItems,int count, MySqlTransaction oSqlTran)

    {
        m_bFlag = false;

        //always reset SqlTrans with connection object

        oSqlTran = null;

        MySqlConnection oConn = new MySqlConnection(Utilities.ConnectionString());


        string sTransName = "Invoice";

        if (oConn.State != ConnectionState.Open)
        {
            oConn.Open();
        }

        oSqlTran = oConn.BeginTransaction();

        //Always associate Connection with Transaction to begin with

        try
        {
            //Add InvoiceDetails table
            if (this.Add(oSqlTran, oConn))
            {

                //Add InvoiceHeader table
                if (oInvoiceLineItems.Add(oSqlTran,count ,oConn))
                {

                    oSqlTran.Commit();

                }


            }
        }
        catch (Exception ex)
        {
            oSqlTran.Rollback();
            m_sbErrMsg.Length = 0;
            m_sbErrMsg = Utilities.ErrorMessage(ex);
            //DB write the Error Log
            m_oErrlog.Add(m_sbErrMsg.ToString(), DateTime.Now);
            throw;

        }
        finally
        {
            oConn.Close(); //always close the connection
        }
        return this.m_bFlag;
    }

    public bool Add(MySqlTransaction oSqlTran, MySqlConnection oConn)
    {
        m_bFlag = false;


        //if (m_oConn.State != ConnectionState.Open)
        //{
        // m_oConn.Open();
        //}

         m_oCmd = new MySqlCommand("uspInvoiceHeaderAdd", oConn);
        m_oCmd.CommandType = CommandType.StoredProcedure;
        m_oCmd.Transaction = oSqlTran;
        m_oCmd.Parameters.AddWithValue("_CustomerID", CustomerID);
        m_oCmd.Parameters.AddWithValue("_InvoiceID", InvoiceID);
        m_oCmd.Parameters.AddWithValue("_Amount", Amount);
        m_oCmd.Parameters.AddWithValue("_PaymentDate", PaymentDate);
        m_oCmd.Parameters.AddWithValue("_Documentype", Documentype);
        m_oCmd.Parameters.AddWithValue("_Flag", Flag);
        m_oCmd.Parameters.AddWithValue("_FedTaxID", FedTaxID);
        m_oCmd.Parameters.AddWithValue("_Memo", Memo);
        m_oCmd.Parameters.AddWithValue("_DueDate", DueDate);


        if (m_oCmd.ExecuteNonQuery() > 0)
        {
            m_bFlag = true;
        }
        return this.m_bFlag;
    }

CREATE DEFINER=`root`@`%` PROCEDURE `uspInvoiceHeaderAdd`(
_CustomerID VARCHAR(50),
_InvoiceID INT,
_Amount DECIMAL(18,2),
_PaymentDate DATETIME,
_Documentype INT,
_Flag NATIONAL CHAR(10),
_FedTaxID CHAR(9),
_Memo VARCHAR(50),
_DueDate DATETIME
)
BEGIN
     insert into tblInvoiceHeader(CustomerID,InvoiceID,Amount,
PaymentDate,Documentype,Flag,FedTaxID,Memo,DueDate)
values(_CustomerID,_InvoiceID,_Amount,_PaymentDate,ifnull(_Documentype,0),_Flag,_FedTaxID,_Memo,_DueDate);
END