[Konstantinos]

You close the parenthesis so it takes only the name from the VehNames array as argument.

pawn Код:

format(str,128,"\"%s\"\the owner is %s",VehNames[GetVehicleModel(vehicleid)-400],GetName(playerid));

By the way, check if the vehicle exists before subtracting 400 from it otherwise you'll get run time error 4.