Email Attachment wont upload

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C#

ASP.NET

email

Hello dear CPers,

I have a web form which functions like a email compose message and send it. I have To,CC, Body area. In addition to them, I have a checkbox where I am having my problem. When user checks this checkbox it supposed to find a file under a specific folder and add a file to the email as an attachment. This process is successfully functioning in my computer. But in the production server this functionality is not working. Here is my code:

MailMessage message = new MailMessage();
                message.IsBodyHtml = true;
                string body = txtTemplate.Text;
                message.Body = body;
                message.Subject = txtEmailSubject.Text;
                message.To.Add(new System.Net.Mail.MailAddress(txtRecipient.Text));
                if (txtCCEmail.Text != "")
                {
                    message.CC.Add(new System.Net.Mail.MailAddress(txtCCEmail.Text));
                }
                message.From = new MailAddress("mail@blabla.com");
                if (chkAttachment.Checked)
                {
                    string shippingLabelPath = HttpContext.Current.Server.MapPath(RMAConfig.LabelPath + "Shipping Label[" + EmailVariables[0].ToString() + "].pdf");
                    string returndocPath = HttpContext.Current.Server.MapPath(RMAConfig.PDFPath + "Return Documentation [ " + EmailVariables[0].ToString() + " ].pdf");
                    if (File.Exists(shippingLabelPath))
                    {
                        Attachment attachedShipping = new Attachment(shippingLabelPath);
                        attachedShipping.ContentDisposition.FileName = "Shipping Label.pdf";
                        message.Attachments.Add(attachedShipping);
                    }
                    if (File.Exists(returndocPath))
                    {
                        Attachment attachedRReturnDoc = new Attachment(returndocPath);
                        attachedRReturnDoc.ContentDisposition.FileName = "Return Documentation.pdf";
                        message.Attachments.Add(attachedRReturnDoc);
                    }
                }
                System.Net.Mail.SmtpClient server = new System.Net.Mail.SmtpClient("mail.blabla.com");
                server.Credentials = new System.Net.NetworkCredential("email@email.com", "*******");
                server.Send(message);              

I have made sure the files exists in the folder and they certainly are there. But they are not getting attached in production server. Is there something I am missing?

Thank you all