[Error] Unit1.pas(28): Undeclared identifier: 'TIdFTP'

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TIdFTP;
ms: TMemoryStream;
begin
ftp:=TIdFTP.Create(Application);
ms:=TMemoryStream.Create;
try
try
ftp.Host:='10.22.1.66';
ftp.Port:=21;
ftp.Username:='******';
ftp.Password:='********';
ftp.Connect(true, 2000);
AssErt(ftp.Connected);
ftp.ChangeDir('/Ñëîáîäñêîé');
ftp.Get('ïðèêàç.jpg','D:\!!!\!\ïðèêàç.jpg',true);
ShowMessage(‘????’);
finally
ms.Free; ftp.Free;
end;
except
ShowMessage (‘????’);
end;
end;
end;

end.