[求助][pascal 错误] Unit1.pas(1):程序有错,不能完成调用

刚刚学delphi,安装好后第一个照书上写的东西去学就碰到这样的问题,请大家帮我解决下:感谢
代码:
unit Unit1;

interface

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

type
TForm1 = class(TForm)
Label1: TLabel;
ok: TButton;
procedure okClick(Sender: TObject);
procedure Label1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.okClick(Sender: TObject);
begin
labell.
end;

procedure TForm1.Label1Click(Sender: TObject);
begin

end;
当我输入红色部分labell.的时候就调处下面的错误提示
[pascal 错误] Unit1.pas(1):程序有错,不能完成调用