link button clicking existing form showing , please

Question

here is my code when am clicking link label   didnt get that form but there showing error 

 

Error18The best overloaded method match for 'OverdueSalesOrder.CallFromReminder(ReminderPopUp)' has some invalid arguments 

 

Error19Argument 1: cannot convert from 'ile' to 'ReminderPopUp' ile.cs

 

 

 

private void lnklblReminderSalesdue_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)

{

try

{

frmOverdueSalesOrder frmoverdueSalesOrderObj = new frmOverdueSalesOrder();

frmOverdueSalesOrder open = Application.OpenForms["frmOverdueSalesOrder"] as frmOverdueSalesOrder;

if (open == null)

{

frmoverdueSalesOrderObj.MdiParent = formMDI.MDIObj;

frmoverdueSalesOrderObj.CallFromReminder(this);

}

else

{

open.Activate();

}

}

catch (Exception ex)

{

MessageBox.Show("pRPU:3" + ex.Message, "", MessageBoxButtons.OK, MessageBoxIcon.Information);

}

}

 public void CallFromReminder(frmReminderPopUp frmReminder)

        {

            try

            {

                base.Show();

                DataTable dtbl = new DataTable();

                dtbl = new ReminderSP().ShortExpiryReminder(0, 0, 0, 0, 0, 0, 0, 0);

                dgvProductExpiry.DataSource = dtbl;

                this.frmReminderPopupObj = frmReminder;

                frmReminderPopupObj.Enabled = false;

            }

            catch (Exception ex)

            {

                MessageBox