A passenger can't pass customs, Make sure a customs booth is accessible through wall and zones

I keep getting this error, every time i create an international terminal, passengers get stuck at the jetway with this message, “A passenger can’t pass customs, Make sure a customs booth is accessible through wall and zones” I look for a custom booth and can’t find it? is it hidden or do i need to upgrade something to get the customs booth. If anyone can help, please let me know!

Carter Cann

Hi please ensure that you have customs both in entering and exiting direction. The same checkpoints are used for entering/exiting the international zone by building them the the other way around.

If this was not the problem please add some screenshots of the airport with your zone-overlay enabled.

Leon