Dex problem with gmax

Ok, so I've downloaded Dex and tried to use it but it doesn't work. See when I run the script in gmax it brings up the export window and has three export options: Export To file, Write To Memory and Print To Listener; I first tried Export To File sense it seemed the most likely to be what I wanted but when I clicked it it brought up an error message saying "gmax users must export using write to memory or print to listener", so I thought alright I guess I can't use that to export so I then clicked write to memory, it also brought up an error message this time saying "this feature is not yet implemented"; I assume this is because its still in beta. So then I try the final option print to listener, that one doesn't have an error message but it doesn't seem to do anything; does anyone know what I should try next?

Thanks.