DataRelation with many-to-many relationships

VS2005 C#
I have books, authors and a bkauthlink table linking the other two tables creating a many-to-many relationship. I have this in Program.cs class:

namespace BooksAuthors

{
static class Program
{
// The main entry point for the application.
[STAThread]

static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm());
}
}
}
and get error on Application.Run(new MainForm());
"Child list for field Authors cannot be created"

Here's the class for the data:


namespace BooksAuthors
{
internal class ClassDataHandling
{
public void MainDataClass()
{
string connString = @"Server=RHOADESD;Integrated Security=True;" +
"Database=BOOKS";

SqlConnection conn = new SqlConnection(connString);
SqlDataAdapter booksAdapter = new SqlDataAdapter(
"Select * from books", conn);

SqlDataAdapter bkauthlinkAdapter = new SqlDataAdapter(
"Select * from bkauthlink", conn);

SqlDataAdapter authorAdapter = new SqlDataAdapter(
"Select * from authors", conn);

conn.Open();


DataSet BookAuthDataSet = new DataSet("BookAuthors");
booksAdapter.Fill(BookAuthDataSet, "books");
bkauthlinkAdapter.Fill(BookAuthDataSet, "bkauthlink");
authorAdapter.Fill(BookAuthDataSet, "authors");

conn.Close();

DataRelation book = BookAuthDataSet.Relations.Add(
"BookRel", BookAuthDataSet.Tables["books"].Columns["booksID"],
BookAuthDataSet.Tables["bkauthlink"].Columns["booksID"]);

DataRelation author = BookAuthDataSet.Relations.Add(
"AuthRel", BookAuthDataSet.Tables["authors"].Columns["authorsID"],
BookAuthDataSet.Tables["bkauthlink"].Columns["authorsID"]);