STK track modelling beginner question - "Atennas" missing

[Mensh123]

Good Morning everyone,
I'm trying to make my first SuperTuxKart Map. When exporting the map Blender tells me the "Antennas" (shown here: https://supertuxkart.net/Making_Tracks: ... start_line) on the driveline are missing, even though they are there. At the same time a success message appearas. I can't find the track so it most likely didn't succeed at all.
Screenshot: see attachment

[tempAnon093]

It might help us if you upload the Blender file, if you're fine with that.

Did the array modifier have the option to merge vertices? This would be needed to make the driveline make sense.