Why?

[Johnathon]

I just done an overlay of schipol airport for cargo aircraft but I'm not seeing any of the cargo planes,I have gates set to heavy about eight of them which are 54m in size and the cargo aircraft only need 39m which is smaller.
I landed at the overlaid airport to find nothing parked and when I contacted ground the only option I could do was request taxi for takeoff but there wasn't any other aircraft parked anywhere so why couldn't I request taxi to parking or gates.

This is strange

can anyone please help

p.s. I have changed my flight plans so the cargo aircraft will use this overlay