most probably this means that NetFlow v9 template is missing some mandatory fields. Here's the list of required fields: Bytes, Packets, Protocol, Source Port, Source Address, Dest Port, Dest Address, InterfaceRx or InterfaceTx (ideally both). Optional fields are Type of Service, SourceAs, DestAS. Setup the device so that template contains all mandatory fields. Check this KB article for details. If that won't help feel free to open support ticket.