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Need help with mod *In control 1.20.1*
I'm trying to use a config file to reduce the frequency of mobs, because in the world, some mobs from jujutsu craft mod too often spawn, and I need to reduce their chance of occurrence, but no matter what code I write, it always shows an error.

Code:

{
  "spawn": [
    {
      "dimension": "minecraft:overworld",
      "mob": "jujutsucraft:stevenson_screen",
      "result": "allow",
      "weight": 1,
      "groupcountmin": 1,
      "groupcountmax": 1
    },
    {
      "dimension": "minecraft:overworld",
      "mob": "jujutsucraft:cursed_spirit_grade_311",
      "result": "allow",
      "weight": 1,
      "groupcountmin": 1,
      "groupcountmax": 1
    }
  ]
}