Node.js mongoose:MissingSchemaError:Schema没有'；I don’我没有注册模特儿

我创建了一个pokedex并将这个pokemons表与它们的类型链接在一起，在浏览互联网时，我找到了在搜索中应用的.populate方法，但我不能

错误

（节点：10256）未经处理的PromisejectionWarning:MissingSchemaError:Schema尚未为模型“GenerationsPokemons”注册

口袋妖怪模型

    const mongoose = require('../../database/index');
const Schema = mongoose.Schema


const PokemonSchema = new mongoose.Schema({
    name: {
        type: String,
        require: true
    },
    pokedexNumber: {
        name: Number,
    },
    image: {
        type: String,
        require: false
    },
    generation: {
        type: Schema.Types.ObjectId,
        ref: "GenerationsPokemons",
    },
    evolutionStage: {
        type: Schema.Types.ObjectId,
        ref: "EvolutionStagePokemon"
    },
    typeone: {
        type: Schema.Types.ObjectId,
        ref: "TypesPokemon",
        require: true
    },
    typetwo: {
        type: Schema.Types.ObjectId,
        ref: "TypesPokemon",
        require: false
    },
    weatherOne: {
        type: Schema.Types.ObjectId,
        ref: "WheaterPokemon",
        require: true
    },
    weatherTwo: {
        type: Schema.Types.ObjectId,
        ref: "WheaterPokemon",
        require: false
    },
    attack: {
        type: Number,
        require: true,
    },
    defense: {
        type: Number,
        require: true,
    },
    stamina: {
        type: Number,
        require: true,
    },
    legendary: {
        type: Schema.Types.ObjectId,
        ref: "LegendarysPokemons",
    },
    max_cp: {
        type: Number,
        require: true,
    },
    cp:{
        type: Number,
        require: true,
    },
    createdAt: {
        type: Date,
        default: Date.now,
        select: false,
    }
})

const Pokemons = mongoose.model('Pokemons', PokemonSchema);

module.exports = Pokemons;

MyServicePokemon.js

async show(name, next) {

    const pokemon = await Pokemons.find({name: name}).populate('generation')
    if (!pokemon) 
        return next (Errors.NotFoundException('Pokemon not found'))
    return pokemon
}

我的世代口袋妖怪

const mongoose = require('../../database/index');
const Schema = mongoose.Schema

const GenerationsPokemonsSchema = new mongoose.Schema({

    generation: {
        type: String,
        require: true
    },
    createdAt: {
        type: Date,
        default: Date.now,
        select: false,
    }

})

const GenerationsPokemons = mongoose.model('GenerationsPokemons', GenerationsPokemonsSchema);

module.exports = GenerationsPokemons;