Custom enchantment does not want to exist??

i tried everything that i could think of and nothing works 😭
{
    "anvil_cost": 1,
        "min_cost": {
        "base": 2,
        "per_level_above_first": 2
    },
    "max_cost": {
        "base": 80,
        "per_level_above_first": 10
    },
    "max_level": 255,
    "description": {"text":"descriptittonroibfjzdqzd"},
    "slots": ["mainhand"],
    "weight": 1,
    "supported_items": "fishing_rod"
}