标识符 mongoose 已经声明

如何解决标识符 mongoose 已经声明

    const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/test',{useNewUrlParser: true,useUnifiedTopology: true});
 


  const Lerischema=new mongoose.Schema({
      title:String,nickname:String,length:Number
  })
  const Leri=mongoose.model('Leri',Lerischema)
  /* const Lerilr= new Leri({title:'dasi',nickname:'ernesto',length:18})
   */
   Leri.insertMany([
       {title:'hirti',nickname:'lix',length:5},{ title:'gero',nickname:'bivre',length:41},{ title:'herti',nickname:'mengo',length:12}
])

所以这是我使用猫鼬的代码，在终端中我经常在终端（cmder）中收到这个标识符错误，我不知道到底是什么问题