Error when InputE :: (Read a, MonadError Err m)

Prelude> :r
[1 of 1] Compiling FME              ( /home/nick/vertigomedia/Union-Haskell/playground-haskell/free-transactions/src/FME.hs, interpreted )

/home/nick/vertigomedia/Union-Haskell/playground-haskell/free-transactions/src/FME.hs:151:8:
    Couldn't match type ‘m1’ with ‘Either Err’
      ‘m1’ is a rigid type variable bound by
           a pattern with constructor
             InputE :: forall next a (m :: * -> *).
                       (Read a, MonadError Err m) =>
                       (m a -> next) -> RetryF next,
           in an equation for ‘runIO’
           at /home/nick/vertigomedia/Union-Haskell/playground-haskell/free-transactions/src/FME.hs:148:8
    Expected type: m1 a1
      Actual type: Either Err a1
    Relevant bindings include
      next :: m1 a1 -> m a
        (bound at /home/nick/vertigomedia/Union-Haskell/playground-haskell/free-transactions/src/FME.hs:148:15)
    In the first argument of ‘next’, namely ‘eth’
    In a stmt of a 'do' block: next eth
Failed, modules loaded: none.