I had the same problem; all I needed to do was open the ics file in a text editor, delete the first 2 lines starting with UID (the UID line for the first 2 events), then I just saved it and imported it. It probably would also work with only deleting the UID line for the first event, but I figured that if it ain't broke, don't try to fix it. Very glad that I didn't need to delete the UID for every event.