thank Leledumbo but still the same error.
program plazmante;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Interfaces, // this includes the LCL widgetset
Forms, UDMmantenimiento, zcomponent, UFRMmantenimiento,
Ufrmnocierre, ZVDateTimeCtrls, ufrmmultiplesalarmas,
Ufrmturno,Graphics,Ufrmservicios,Ufrmnotaoperador, ufrmbalance;
{$R *.res}
begin
Application.Initialize;
Application.CreateForm(TDMmantenimiento, DMmantenimiento);
Application.CreateForm(TForm1, Form1);
Application.Run;
end.