Printer Driver is not specified

I am using tsclib.dll to print labels on Bematech LB-1000. In the procedure openport () already gives the error Printer Driver is not specified.

The printer is local, USB port and I am passing its name as a parameter like this:

openport ('Bematech');

as explained in the dll instruction manual. But even following the instructions, this error continues. Using the printer's own commands, it works normally. I believe the problem is really in the dll.

Has anyone ever had this problem and do you know how to help me?

code:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    Button1: TButton;
    Image1: TImage;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
{$R GenericLIB.RES}

procedure openport(PrinterName:pchar);stdcall;far; external 'tsclib.dll';
procedure closeport; external 'tsclib.dll';
procedure sendcommand(Command:pchar);stdcall;far;external 'tsclib.dll';
procedure setup(LabelWidth, LabelHeight, Speed, Density, Sensor, Vertical,             Offset:pchar);stdcall; far; external 'tsclib.dll';
procedure downloadpcx(Filename,ImageName:pchar);stdcall;far;external     'tsclib.dll';
procedure barcode(X, Y, CodeType, Height, Readable, Rotation, Narrow, Wide,     Code :pchar); stdcall; far; external 'tsclib.dll';
procedure printerfont(X, Y, FontName, Rotation, Xmul, Ymul,     Content:pchar);stdcall;far; external 'tsclib.dll';
procedure clearbuffer; external 'tsclib.dll';
procedure printlabel(NumberOfSet, NumberOfCopoy:pchar);stdcall; far;external     'C:\Windows\System32\tsclib.dll';
procedure formfeed;external 'tsclib.dll';
procedure nobackfeed; external 'tsclib.dll';
procedure windowsfont (X, Y, FontHeight, Rotation, FontStyle, FontUnderline : integer; FaceName, TextContect:pchar);stdcall;far;external 'tsclib.dll';

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;

begin

  openport('Bematech');
        for i:=1 to 1 do
         begin
          clearbuffer;
          sendcommand('DIRECTION 1');
          windowsfont(10, 10, 30, 0, 2, 0, 'arial', 'Exemplo LB - 1000     Delphi - Bematech');
          barcode('10', '100', '128', '100', '1', '0', '2', '2', '1234567-    BEMATECH');
          printlabel('1', '1');
        end;
          closeport;


end;

end.