I have the recipe here done the vanilla way but it doesn't work.

{
  "type": "crafting_shapeless",
  "ingredients": [
    {
      "item": "minecraft:prismarine_shard"
    },
    {
      "item": "minecraft:prismarine_shard"
    },
    {
      "item": "minecraft:prismarine_shard"
    },
    {
      "item": "minecraft:prismarine_shard"
    },
    {
      "item": "minecraft:prismarine_crystals"
    },
    {
      "item": "minecraft:prismarine_crystals"
    },
    {
      "item": "minecraft:prismarine_crystals"
    },
    {
      "item": "minecraft:prismarine_crystals"
    },
    {
      "item": "minecraft:diamond"
    }
  ],
  "result":
  {
    "item": "mcge:prismarine_gem",
    "count": 1
  }
}

 

2 hours ago, Eilux said:

I have the recipe here done the vanilla way but it doesn't work.

Where is the file located? And is anything output into the console?

 

2 hours ago, Eilux said:

mcge

This is a bad modid. Dont use acronyms someone else could use this and then your mods wont be compatible.

I have found the problem i forgot to put minecraft: in front of crafting_shapeless