Errors with lenses

gistfile1.txt

SNES/CPU.hs:1963:48:
    No instance for (Applicative
                       (Control.Lens.Internal.Context.Pretext (->) Word8 Word8))
      arising from a use of `traversed'
    Possible fix:
      add an instance declaration for
      (Applicative
         (Control.Lens.Internal.Context.Pretext (->) Word8 Word8))
    In the first argument of `(.)', namely `traversed'
    In the second argument of `(.)', namely
      `traversed . index 1 . tilemapHigh'
    In the second argument of `Range', namely
      `(backgrounds . traversed . index 1 . tilemapHigh)'

SNES/CPU.hs:1993:36:
    No instance for (Monoid Word16) arising from a use of `traversed'
    Possible fix: add an instance declaration for (Monoid Word16)
    In the first argument of `(.)', namely `traversed'
    In the second argument of `(.)', namely
      `traversed . index n . horizontalOffset'
    In the second argument of `(.)', namely
      `backgrounds . traversed . index n . horizontalOffset'
Failed, modules loaded: none.