Spread Extract as JPEG not show image on spread

Hi Experts

I create Indesign Document(CS5.5) file on MAC OS using script, which contain text and images on spread.

My file is created sucessfully. Now I exterect spreads as image(JPEG) using script

#target indesign

var myDocument =app.activeDocument;

myDocument.exportFile(ExportFormat.JPG,File("/private/var/root/Desktop /1.jpg"),false)

with(app.jpegExportFormatPreferences)

{

exportingSpread=true;

}

First time when I start My MAC system it extract spread sucessfully with image data. If I exteract again then exteract image contain only text data and image data is not present.

If I restart my MAC system then same result(first time present second time not)

While on window there is no such problem .

How solve this problem ?

Thanks.