Menucurser programming, menu display exception

Menucurser programming, menu display exception-General Linux technology-Linux programming and kernel information, the following is read details. The code is as follows:
==========> Obtain the menu item function ================================== =====
MainItems = (ITEM **) calloc (80, sizeof (ITEM *));
I = 0;
While (fgets (sLine, sizeof (sLine), fp )! = NULL)
{
If (ParseLine (sLine, 2, sItem ))
{
// MainItems = new_item (sItem [0], sItem [1]); // 1
MainItems = new_item ("BBB", "AAAAA"); // 2
I ++;
}
}
============> Display menu functions ==================================== ====
Keypad (pWorkWin, TRUE );
MainMenu = new_menu (ITEM **) mainItems );

Set_menu_win (mainMenu, pWorkWin );
Set_menu_sub (mainMenu, derwin (pWorkWin, 6, 38, 10, 10 ));
Set_menu_mark (mainMenu, "> ");
Refresh ();

Post_menu (mainMenu );
Wrefresh (pWorkWin );
========================================================== =
Content of the file to which fp points:
0000 | AAAAA |
0001 | BBBBB |
0002 | CCCC |
Print and show that the content of sItem [0] sItem [1] is correct
If 2 new_item is used, the correct menu is displayed.

However, if 1 new_item is used, the menu is empty.

==========================================================

I don't know why.