public void registerSubstitutedBlocks(FMLInitializationEvent event)
    {
        try
        {
            GameRegistry.addSubstitutionAlias("minecraft:snow", GameRegistry.Type.BLOCK, snowBlock);
            GameRegistry.addSubstitutionAlias("minecraft:ice", GameRegistry.Type.BLOCK, iceBlock);
        }
        catch (ExistingSubstitutionException e)
        {
            e.printStackTrace();
        }
    }