Haskell, Aeson - no instance for (ToJSON ByteString)

So happy making it this far, encountered a new hurdle: Got this code made to be encoded to JSON. However no matter when type I use as an instance, the compiler complains. Now I am obviously doing something wrong, but it is exactly what is in the documentation (when using DeriveGeneric obviously).

{-# LANGUAGE OverloadedStrings, DeriveGeneric #-}

import Data.Aeson
import Data.Text as T
import Data.ByteString.Lazy as B
import Data.ByteString.Lazy.Char8 as BC
import GHC.Generics

-- decode :: FromJSON a => B.ByteString -> Maybe a
-- decode' :: FromJSON a => B.ByteString -> Either String a
-- encode :: ToJSON => a -> B.ByteString

data System = System  { system :: BC.ByteString
                  , make :: BC.ByteString
                  , code :: Int
                  } deriving (Generic, Show)
instance ToJSON System
-- instance FromJSON System

platform = System { system = "FPGA"
                  , make = "Xilinx"
                  , code = 10165
                  }
encodePlatform :: BC.ByteString
encodePlatform = encode platform

Compiler output:

    • No instance for (ToJSON ByteString)
        arising from a use of ‘aeson-1.4.1.0:Data.Aeson.Types.ToJSON.$dmtoJSON’
    • In the expression:
        aeson-1.4.1.0:Data.Aeson.Types.ToJSON.$dmtoJSON @(System)
      In an equation for ‘toJSON’:
          toJSON = aeson-1.4.1.0:Data.Aeson.Types.ToJSON.$dmtoJSON @(System)
      In the instance declaration for ‘ToJSON System’
   |
17 | instance ToJSON System