I get this error with Next.js Here is my question schema (Question.js):
const mongoose = require('mongoose')
const questionModel = mongoose.Schema({
  user: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'user',
    required: true
  },
  title: {
    type: String,
    required: true
  },
  body: {
    type: String,
    required: true
  },
  createdAt: {
    type: Date,
    default: Date.now
  },
  likes: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: 'user',
    required: true
  }],
  tags: [{
    type: String,
    required: true
  }]
})
const Question = mongoose.model('question', questionModel)
module.exports = Question
There's this similar question: here, but it didn't work to me.
Does anyone have a solution?