I did as Luis said using locfile and also as below, but the error is the same.

Below is the full code

SET PATH TO BARCODE\FoxBarcode\Source

SET PROCEDURE TO FoxBarcode.prg ADDITIVE

SET PROCEDURE TO gpImage2.prg ADDITIVE


*-- Create object
loFbc = CREATEOBJECT("FoxBarcode")

*-- Set the properties
WITH loFbc
  .cImageType = "PNG"
  .nBarcodeType = 110 && Code 128
  .cSet128 = "C" && Set 128 C
  .nImageHeight = 100
  .nFactor = 2
ENDWITH

*-- Generate image
lcImagen = loFbc.BarcodeImage("123456789012")