抛出新的mongoose.Error.MissingSchemaError(MissingSchemaError) MissingSchemaError:尚未为模型"superheros“注册架构

const mongoose = require('mongoose');

const superheroSchema = new mongoose.Schema({
  name: String,
  power: String,
  universe: String
});

const Superhero = mongoose.model('Superhero', superheroSchema);

mongoose.model('Superhero', superheroSchema);

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB:', error);
  });