Version Information

Forge version: 47.4.9
Masterful Machinery version: 3-1.20.1-0.1.25

ADD ON'S
if not installed just put "null"
Optifine version: null
Botania version: null
Create version: 6.0.6
Mekanism version: 10.4.16.80
Pneumaticcraft version: null
Astral Sorcery version: null

Further Information

Link to latest.log: latest.log
Steps to reproduce:

1. create a multiblock
2. create a recipe for it

What I expected to happen:
for it not crash nd allow me to create a new world as the orignal world apprently got corrupted

What happened instead:
it crashed

You might be missing the key count somewhere in your recipe, if you can paste your recipe we can look over it and fix it.
count has to be present in all item ingredients, even if its set to 1

here: MMEvents.createProcesses(event => {
event.create("mm:alloying")
.structureId("mm:alloyer")
.ticks(1000)
.input({
type: "mm:input/consume",
ingredient: {
type: "mm:item",
item: "minecraft:iron_ingot",
count: 1
}
})
.input({
type: "mm:input/consume",
ingredient: {
type: "mm:item",
item: "minecraft:coal",
count: 2
}
})
.output({
type: "mm:output/simple",
ingredient: {
type: "mm:item",
item: "mekanism:steel_ingot",
amount: 1
}
})
})

you have amount: 1 at the very bottom this should be count: 1

thanks