I'm currently playing Enigmatica 2 Expert (1.12.2), and added this mod as it's very handy for lategame. However, when crafting charged draconium blocks (or any recipe in the combination package crafter), the game crashes, and gives me the following error:

The game crashed whilst ticking block entity
Error: java.lang.NoSuchMethodError: com.blakebr0.extendedcrafting.crafting.CombinationRecipe.getCost()J
Exit Code: -805306369

Any idea why, or how to fix this?

Is it possible for you to update Extended Crafting