How to use ge.SaveScreenShot method?

I've successfully launched GoogleEarth Pro (v 7.3) from Matlab using Gus Brown's contribution, and I'm having an error on saving the image as a screenshot:

    ge      = GEserver;
    ge.SetCameraParams(40.8501111,-74.0608333,300000,1,000,00,0,5);
    [ point, bounds ] = GEcamera( ge );

    filename = 'test.jpg';
    ge.SaveScreenShot(filename, 'best');

    No method 'SaveScreenShot' with matching signature found for class
    'COM.GoogleEarth_ApplicationGE'.

What am I doing wrong?