angry at addon airports

ok so heres what happened.
i downloaded an addon for changi airport (wsss) which changed the whole airport-the buildings,the runways,everything.
So i landed,got clearance to taxi to gate and turned on progressive taxi. Just before parking by gate, i got a message saying building crash
From the outside of the plane, it is clearly not hitting the building.
WHY DID THIS HAPPEN???

does it have an ACDF file or something like that i forget what their called.... anyway did you put it in the rite file?

yeh check for the AFCAD files.

ahh thankyou people!!!!!