DELPHI编译错误

代码如下,请告诉解决办法.以及出现问题的原因
unit mainform;

interface

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

type
Tfrmmain = class(TForm)
close: TButton;
procedure FormCreate(Sender: TObject);
procedure closeClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
frmmain: Tfrmmain;

implementation

{$R *.dfm}

procedure Tfrmmain.FormCreate(Sender: TObject);
begin
caption:='oop is important';
end;

procedure Tfrmmain.closeClick(Sender: TObject);
begin
close ;
end;

end.

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