2 files changed, 2 insertions, 2 deletions

diff --git a/src/LambdaCube/GL/Backend.hs b/src/LambdaCube/GL/Backend.hs
index 4280876..619ea76 100644
--- a/src/LambdaCube/GL/Backend.hs
+++ b/src/LambdaCube/GL/Backend.hs
@@ -627,7 +627,7 @@ setStorage' p@GLRenderer{..} input' = do
                     return (i,Nothing)
             -- create input connection
             let sm      = slotMap input
-                pToI    = [i | n <- glSlotNames, let i = fromMaybe (error $ "missing object array: " ++ n) $ Map.lookup n sm]
+                pToI    = [i | n <- glSlotNames, let i = fromMaybe (error $ "setStorage - missing object array: " ++ n) $ Map.lookup n sm]
                 iToP    = V.update (V.replicate (Map.size sm) Nothing) (V.imap (\i v -> (v, Just i)) pToI)
             writeIORef glInput $ Just $ InputConnection idx input pToI iToP
 
diff --git a/src/LambdaCube/GL/Mesh.hs b/src/LambdaCube/GL/Mesh.hs
index 5c16e42..1b1b823 100644
--- a/src/LambdaCube/GL/Mesh.hs
+++ b/src/LambdaCube/GL/Mesh.hs
@@ -50,7 +50,7 @@ data GPUMesh
 addMeshToObjectArray :: GLStorage -> String -> [String] -> GPUMesh -> IO Object
 addMeshToObjectArray input slotName objUniNames (GPUMesh _ (GPUData prim streams indices _)) = do
     -- select proper attributes
-    let (ObjectArraySchema slotPrim slotStreams) = fromMaybe (error $ "missing object array: " ++ slotName) $ Map.lookup slotName $! objectArrays $! schema input
+    let (ObjectArraySchema slotPrim slotStreams) = fromMaybe (error $ "addMeshToObjectArray - missing object array: " ++ slotName) $ Map.lookup slotName $! objectArrays $! schema input
         filterStream n _ = Map.member n slotStreams
     addObject input slotName prim indices (Map.filterWithKey filterStream streams) objUniNames