Oh, if you’re already talking to him, tell him to go through every single taxipath point (or you can, I think you can see it in dev mode when you turn them on) and make sure they are connected, and make sure the hold shorts are attached and in the proper direction. That’s the first thing I would do.
After that, he has to make sure that all parking spots are properly connected to the taxi paths, and it’s better if they don’t overlap. There’s a I think 6 m boundary around the spots that can’t overlap with the next spots or planes can’t park next to each other. Given that’s unrealistic, I overlap my parking spots. It just means planes can’t park next to each other in those situations. Sad, but a limitation that’s hard for them to fix for a few reasons. You can see the overlaps if you turn on the parking spots.