Ошибка при запуске программы

unit D_Churnal_privi;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DataModel, StdCtrls, Mask, DBCtrls, DB, dblookup, Buttons;
 
type
  TForm5 = class(TForm)
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    DBEdit1: TDBEdit;
    DBEdit2: TDBEdit;
    DBEdit3: TDBEdit;
    DBEdit4: TDBEdit;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
 
    procedure DBEdit1Click(Sender: TObject);
    procedure DBEdit3Click(Sender: TObject);
 
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
student1:string;
  Form5: TForm5;
 
implementation
 
uses DB_Student, DBVid;
 
{$R *.dfm}
 
procedure TForm5.BitBtn1Click(Sender: TObject);
begin
//DBEdit1.DataField :=DataModule2.ADO_churnal_privivok.Fields[1].FieldName;
//DBEdit1.Text:=student1;
if DataModule2.ADO_churnal_privivok.State in [dsInsert,dsEdit] then DataModule2.ADO_churnal_privivok.Post;
 
 // DBEdit1.DataField :='lookstud';
 close;
end;
 
procedure TForm5.BitBtn2Click(Sender: TObject);
begin
DataModule2.ADO_churnal_privivok.Cancel;
Close;
end;
 
procedure TForm5.DBEdit1Click(Sender: TObject);
begin
Form18.ShowModal;
end;
 
procedure TForm5.DBEdit3Click(Sender: TObject);
begin
Form19.ShowModal;
end;
 
end.