IF NOT IS NULL doesn't work

[Siercito]

Hi experts, I'm trying to load the last 12 months info's and this is not working.

Before this code I have a table "PERIODOS" where I have the periods of my info

Here is the code

SET VUELTAS = 12;

FOR i = 0 TO $(VUELTAS)

LET vPeriodosBuscados = date(PEEK('ULT_PERIODO', i, 'PERIODOS'),'YYYYMM');

SET vFileName = '[lib://DataFiles/DETALLE_ORDENES_(vPeriodosBuscados).qvd]';

LET vFileSize = FileSize($(vNombreArchivo));

IF NOT IsNull(vFileSize) THEN

ORDENES_PERIODO:
LOAD
ID_ORDEN,
ID_CLIENTE,
ID_EMPLEADO,
TRANSPORTE,
AÑO,
MES,
DIA,
FECHA,
COUNT_ID_PRODUCTO_ORD,
ID_REPARTO,
PERIODO,
ID_PRODUCTO,
DESCUENTO,
NRO_LINEA,
COUNT_PRODUCTO_DET,
CANTIDAD,
PRECIO_UNINTARIO,
MONTO_DE_VENTA
FROM [lib://DataFiles/DETALLE_ORDENES_$(vPeriodosBuscados).qvd]
(qvd);
ENDIF

NEXT

 The info doesn't load and the vPeriodosBuscados have the right info when I use the debbug

[Or]

Your code doesn't seem to be setting $(vNombreArchivo) - what's in that variable? That is the one you're testing for filesize...

[Siercito]

Sorry, it's the same vFileName variable, when I posted I change some of the names to English and I forgot that.

I use the vFileName variable.

LET vFileSize = FileSize($(vFileName));

[Or · Accepted solution]

There also looks to be a dollar sign missing:

SET vFileName = '[lib://DataFiles/DETALLE_ORDENES_$(vPeriodosBuscados).qvd]';