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var myPDFExportPreset = app.pdfExportPresets.item("High Quality Print");
myDoc.exportFile(ExportFormat.pdfType, myFile, myPDFExportPreset);

The above is an excerpt of a huge script so I cannot post it all but the error I get here is:
Invalid value for parameter 'showingOption' of event 'exportFile'. Expected Boolean but received nothing.

What am I doing wrong here? I have actually used the above code from threads in this forum which apparently have worked for others.

If I replace myPDFExportPreset with false, the PDF is created but I think it is using the default preset which is not "High Quality Print"

Cheers
Norbert