I've been using Crafttweaker in my pack to tweak some recipes in Nuclearcraft, every recipe has worked up until now. I'm trying to remove the bronze alloy recipe from the Alloy Furnace.

mods.nuclearcraft.alloy_furnace.removeRecipe(nuclearcraft:alloy:0);

Removing other recipes from the furnace seems to work, although this one doesn't. Writing /ct syntax in-game prints no errors. However, upon joining the game a message pops up saying:

ERROR: alloy_furnace: Removing Recipe - Couldn't find matching recipe [1xitem.alloy@0]

EDIT: My bad had been thinking about this all week and only now writing up the report have I found the issue.. I was trying to remove a recipe that made only 1 alloy ingot. When the actual recipe makes 4.

Ah, yes, that would be it - glad you got that sorted. I hadn't done much testing with recipe removal so it's nice to know that it's working :)