Flight Game Example problem,

I have merge the package Fight Game Example into the TGEA,but when create a object that show the error below:
Namespace::unlinkClass - cannot unlink namespace parent linkage for AIFlyingVehicle for FlyingVehicle.
Error: cannot change namespace parent linkage of AIFlyingVehicle from FlyingVehicle to AIRepairshipFlyingVehicle.
Do any one know what`s the problem?
Thanks!