747-400 multiple file error

hi

i downloaded a new plane called klm 747-400 and i put it in my simobjects/airplanes folder in a folder that i created called klm 747. but now when i go into fsx it says
'there are multiple objects with the same title name. they must have unique title names.
boeing 747-400 paint 1
simobjects\airplanes\klm 747'

it says that multiple times but every time it says a different file name like 'boeing 747-400 paint 2' all the way to 'boeing 747-400 paint 9'

i have searched the fsx folder to find all these 'boeing 747-400 paint' things but it doesnt find anything.

can anyone please tell me why it says this its driving me crazy!