diff --git a/src/coin-selection/lib/Convex/CoinSelection.hs b/src/coin-selection/lib/Convex/CoinSelection.hs
index c19da818..c070f834 100644
--- a/src/coin-selection/lib/Convex/CoinSelection.hs
+++ b/src/coin-selection/lib/Convex/CoinSelection.hs
@@ -221,14 +221,15 @@ data BalancingError era
   = BalancingError Text
   | -- | A single type of balancing error is treated specially: the type with
     -- 'C.ScriptExecutionError's.
-    -- TODO: I would like to retain the actual error structure, but this collides (quite massively)
-    -- with the required JSON encoding / decoding.
-    ScriptExecutionErr Text -- [(C.ScriptWitnessIndex, C.ScriptExecutionError)]
+    ScriptExecutionErr [(C.ScriptWitnessIndex, C.ScriptExecutionError)]
   | CheckMinUtxoValueError (C.TxOut C.CtxTx era) C.Quantity
   | BalanceCheckError (BalancingError era)
   | ComputeBalanceChangeError
   deriving stock (Show, Generic)
-  deriving anyclass (ToJSON, FromJSON)
+
+-- TODO: I would like to retain the actual error structure in ScriptExecutionError, but this collides (quite massively)
+-- with the required JSON encoding / decoding.
+--  deriving anyclass (ToJSON, FromJSON)
 
 makeClassyPrisms ''BalancingError
 
@@ -238,7 +239,7 @@ data constructor.
 balancingError :: (MonadError (BalancingError era) m) => Either (C.TxBodyErrorAutoBalance era) a -> m a
 balancingError = \case
   Right a -> pure a
-  Left err@(C.TxBodyScriptExecutionError _es) -> throwError $ ScriptExecutionErr (asText err)
+  Left (C.TxBodyScriptExecutionError es) -> throwError $ ScriptExecutionErr es
   Left err -> throwError . BalancingError $ asText err
  where
   asText = Text.pack . C.docToString . C.prettyError
@@ -646,7 +647,8 @@ data BalanceTxError era
   = ACoinSelectionError CoinSelectionError
   | ABalancingError (BalancingError era)
   deriving stock (Show, Generic)
-  deriving anyclass (ToJSON, FromJSON)
+
+--  deriving anyclass (ToJSON, FromJSON)
 
 makeClassyPrisms ''BalanceTxError