Выдает ошибку [Error] Unit1.pas(56): Incompatible types

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
 
type
  TForm1 = class(TForm)
    EditTop: TEdit;
    EditLeft: TEdit;
    EditStep: TEdit;
    EditPause: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    btnShowForm: TButton;
    btnMoveForm: TButton;
    procedure EditTopKeyPress(Sender: TObject; var Key: Char);
    procedure btnShowFormClick(Sender: TObject);
    procedure btnMoveFormClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
uses Unit2;
 
{$R *.dfm}
 
procedure TForm1.EditTopKeyPress(Sender: TObject; var Key: Char);
begin
If not (key in ['0'..'9']) then key:=#0;
end;
 
procedure TForm1.btnShowFormClick(Sender: TObject);
begin
Form2.Top:=StrToInt(Form1.EditTop.Text);
Form2.Left:=StrToInt(Form1.EditLeft.Text);
Form2.Show;
end;
 
procedure TForm1.btnMoveFormClick(Sender: TObject);
var value,x,y: integer;
begin
 value:=Screen.Width;
 y:=round(value-Form2.Width);
 x:=Form2.Left;
 While x<y>=StrToInt(EditStep.Text) do
 begin
 x:=x-StrToInt(EditStep.Text);
 Form2.Close;
 Form2.Left:=x;
 Form2.Show;
 Sleep(StrToInt(EditPause.Text));
 end;
end;
end.