Avoid "Import PDF" dialogue in Photoshop Scripting

Hi there,

So I am doing the Scripting Guide example of Importing a pdf and unfortunately when using this option seems that Photoshop is prompting for more options for the PDF, on what it kills the purpose of the Script

At the moment I am on

var fileRef = new File ("/c/myfile/path.pdf");

var pdfOpenOptions = new PDFOpenOptions;
pdfOpenOptions.antiAlias = true;
pdfOpenOptions.mode = OpenDocumentMode.RGB;
pdfOpenOptions.resolution = 72;
pdfOpenOptions.page = 3;
app.open(fileRef, pdfOpenOptions);

And is prompting an "Import PDF" dialogue.
Anyone knows how to supress thisone? Thank you