trying to make a advanced ment

im trying to make a advancedment for getting all ores in the game heres the code 
{
  "display": {
    "icon": {
      "id": "minecraft:deepslate_emerald_ore"
    },
    "title": "Master Prospecto",
    "description": "Get all overworld ores and smelt them (no silk touch)",
    "frame": "challenge",
    "announce_to_chat": true
  },
  "criteria": {
    "requirement": {
      "trigger": "minecraft:inventory_changed",
      "conditions": {
        "slots": {
          "empty": {
            "min": 1,
            "max": 27
          }
        },
        "items": [
          {
            "items": "minecraft:redstone"
          },
          {
            "items": "minecraft:copper_ingot"
          },
          {
            "items": "minecraft:coal"
          },
          {
            "items": "minecraft:gold_ingot"
          },
          {
            "items": "minecraft:lapis_lazuli"
          },
          {
            "items": "minecraft:iron_ingot"
          },
          {
            "items": "minecraft:emerald"
          },
          {
            "items": "minecraft:diamond"
          }
        ]
      }
    }
  },
  "rewards": {
    "function": "ep:ore_advancement",
    "experience": 825
  }
}
heres the error and its this same one for many other lines
[{
    "resource": "/c:/Users/joseph/AppData/Roaming/.minecraft/saves/Datapack TESTING YAY _(/datapacks/click_detection/data/ep/advancements/ores_advancement.json",
    "owner": "generated_diagnostic_collection_name#1",
    "severity": 8,
    "message": "Missing key “item”.",
    "source": "datapack",
    "startLineNumber": 3,
    "startColumn": 15,
    "endLineNumber": 3,
    "endColumn": 16
}]