Error: cosmpy.aerial.exceptions.InsufficientFeesError: Insufficient Fees (minimum required: 981940000000000000mpx)

[raccoon464]

I include MINEPLEX network! and I want to send token mpx. For that I use next command:

wallet = LocalWallet(PrivateKey(), prefix="mx")
tx = ledger.send_tokens('mx175jyetpvdtrg4xqhdmrxytcmraw7g6cx666mda', 1000000000000000000, "mpx", wallet)

my error: cosmpy.aerial.exceptions.InsufficientFeesError: Insufficient Fees (minimum required: 981940000000000000mpx)