which version of the software are you using? This looks like a pretty old code.
Please do get the latest updated version from support.
I'm using the 1.0.1.42, I think, this is the last one.
I pressed it, then it ask me the folder to save but it save nothing.I think you need to click on 'export to database', to get the .csv file of those ids, which can be then used with the FB ads or whatever thing you need it for.
Of course, my aim is to use the IDs list into FB ads