Error when inserting file "Column name or number of supplied values does not match table definition" please help

private void Button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDlg = new OpenFileDialog();
            openFileDlg.InitialDirectory = Directory.GetCurrentDirectory();
            if (openFileDlg.ShowDialog() == DialogResult.OK)
            {
                FileInfo fi = new FileInfo(openFileDlg.FileName);
                FileStream fs = new FileStream(fi.FullName, FileMode.Open, FileAccess.Read);
                BinaryReader rdr = new BinaryReader(fs);
                byte[] fileData = rdr.ReadBytes((int)fs.Length);
                rdr.Close();
                fs.Close();

                string cs = @"Data            Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\SATDB.mdf;Integrated Security=True;User Instance=True";
                using (SqlConnection con = new SqlConnection(cs))
                {
                    con.Open();
                    string sql = "INSERT INTO SAT VALUES (@Trial_Addmission, default)";
                    SqlCommand cmd = new SqlCommand(sql, con);
                    cmd.Parameters.Add("@Trial_Addmission", SqlDbType.VarBinary, fileData.Length).Value = fileData;
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }

        }