Access Violation i event

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, AsioP1, StdCtrls;

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

var
  Form1: TForm1;
  Asio: TAsioP1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  Asio.SessionStart;
end;

procedure TForm1.AsioError(Sender: TObject; Err: Integer);
begin
  ShowMessage('Error: '+IntToStr(Err));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Asio.OnError := AsioError; <---------- giver access violation
end;

initialization

end.



Hvorfor :(