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Error: Forward declaration not solved But1Click(TObject);
И так на все процедуры
unit Unit1;

{$mode objfpc}{$H+}

interface

uses
Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls;

type

{ TForm1 }

TForm1 = class(TForm)
But1: TButton;
But10: TButton;
But11 ...