重复标识符错误

我只是在我的Lazarus上编码,没有改变 TForm 声明。然后我尝试测试我的应用程序,但在编译时我得到了以下错误:

TomAct.lpr(11,43) Error: Duplicate identifier "TOMACT"
TomAct.lpr(15,32) Error: Identifier not found "TForm1"
TomAct.lpr(15,39) Error: Identifier not found "Form1"
TomAct.lpr(19) Fatal: There were 3 errors compiling module, stopping

下面是我的*.lpr文件的内容:

program TomAct;

{$mode objfpc}{$H+}

uses
  {$IFDEF UNIX}{$IFDEF UseCThreads}
  cthreads,
  {$ENDIF}{$ENDIF}
  Interfaces, // this includes the LCL widgetset
  Forms
  { you can add units after this }, TomAct;

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.

我需要做什么?