[Solved] ASP.Net Error: Your file couldnt be accessed It may have been moved, edited, or deleted. ERR_FILE_NOT_FOUND

I created a site where I issue PDF or JPEG documents files to clients with a QR code on the documents. The issue I am facing is that when the QR code is scanned it displays a link with the document ID and when I navigate to the link it shows this:

Your file couldn't be accessed It may have been moved, edited, or deleted. ERR_FILE_NOT_FOUND

But the file is inside the httpdocs folder in my Plesk. How do I resolve this?

Here is the link it displays on a QR code scanner G:\PleskVhosts\docissuers.com\httpdocs\UIdoc.aspx?Id=3

here is the code used to generate the QR code

C#

private string imgBytes;
private object Inv;
 
protected void Page_Load(object sender, EventArgs e)
{
    BindCardAndQR();
}
 
private void BindCardAndQR()
{
    if (Session["paperinv"] != null)
    {
        int id = Convert.ToInt32(Session["paperinv"]);
 
        string sql = "SELECT * FROM tableinvoice WHERE Id = @Id";
        SqlParameter[] parameters = new[] {
                new SqlParameter("@Id", id)
            };
 
        // Bind Image3 for Card Image
        DataTable dt = SelectFromDatabase(sql, parameters);
        if (dt.Rows.Count > 0)
        {
            string embed = "<object data=\"{0}{1}\" type=\"application/pdf\"></object>";
            ltEmbed.Text = string.Format(embed, ResolveUrl("Handler.ashx?Id="), id);
 
            byte[] QRBytes = GetQRCodeBytes(Server.MapPath("~/IUdoc.aspx") + "?Id=" + id);
            Image1.ImageUrl = "data:image/jpg;base64," + Convert.ToBase64String(QRBytes);
        }
    }
}
public byte[] GetQRCodeBytes(string url)
{
    //QR code generated here
    QRCodeEncoder encoder = new QRCodeEncoder();
    Bitmap bi = encoder.Encode(url);
    MemoryStream tmpSteam = new MemoryStream();
    bi.Save(tmpSteam, ImageFormat.Jpeg);
    return tmpSteam.ToArray();
}
public static DataTable SelectFromDatabase(string sql, SqlParameter[] parameters)
{
    using (SqlConnection con = new SqlConnection("myconstring"))
    {
 
        using (SqlCommand cmd = new SqlCommand(sql, con))
        {
            if (parameters != null)
            {
                cmd.Parameters.AddRange(parameters);
            }
 
            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
            {
                DataTable dt = new DataTable();
                sda.Fill(dt);
                return dt;
            }
        }
    }
}