C# Syntax Error When Insert Data Using a Form into a Access Database

con = new OleDbConnection(cs);
                con.Open();

                string cb = "insert into Users(UserID,UserName,UserType,Cluster,Password,Email) VALUES (@d1,@d2,@d3,@d4,@d5,@d6)";

                cmd = new OleDbCommand(cb);

                cmd.Connection = con;

                cmd.Parameters.Add(new OleDbParameter("@d1", OleDbType.Char, 30, "UserID"));

                cmd.Parameters.Add(new OleDbParameter("@d2", OleDbType.Char, 30, "UserName"));
                cmd.Parameters.Add(new OleDbParameter("@d3", OleDbType.Char, 10, "UserType"));

                cmd.Parameters.Add(new OleDbParameter("@d4", OleDbType.Char, 30, "Cluster"));
                cmd.Parameters.Add(new OleDbParameter("@d5", OleDbType.Char, 30, "Password"));


                cmd.Parameters.Add(new OleDbParameter("@d6", OleDbType.Char, 30, "Email"));


                cmd.Parameters["@d1"].Value = TxtUID.Text.Trim();
                cmd.Parameters["@d2"].Value = TxtUname.Text;
                cmd.Parameters["@d3"].Value = CmbUtype.Text;
                cmd.Parameters["@d4"].Value = CmbCluster.Text;
                cmd.Parameters["@d5"].Value = TxtPw.Text;
                cmd.Parameters["@d6"].Value = TxtEml.Text;
                cmd.ExecuteReader();




                con.Close();
                MessageBox.Show("Successfully Registered", "User", MessageBoxButtons.OK, MessageBoxIcon.Information);


            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

        }