title: Child list for field " " cannot be created
body: <p>I have the following set of codes for adding values to my <code>DataGridView</code> through <code>DataTable</code> as my datasource. However, it keeps on giving me the error "Child list for field <code>tbl_main</code> cannot be created". Anybody can help me identify the problem? </p>
  
  <pre><code>dgvMySchedule.Columns.Clear();
  dgvMySchedule.Rows.Clear();
  dgvMySchedule.ClearSelection();
  
  dataSet.Tables.Add(tbl_main);
  dgvMySchedule.DataSource = dataSet;
  dgvMySchedule.DataMember = "tbl_main";
  
  tbl_main.Columns.Add("TIME");
  tbl_main.Columns.Add("CLASS");
  
  DataRow row;
  dgvMySchedule.RowTemplate.Height = 8;
  for (int i = 0; i &lt;= 71; i++)
  {
      row = tbl_main.NewRow();
      row["TIME"] = i;
      row["CLASS"] = i;
      tbl_main.Rows.Add(row);
  }
  </code></pre>