Erreur: code d'authentification manquant (cryptage Mongoose)

Je reçois cette erreur lors de la connexion à un utilisateur enregistré, bien sûr, j'ai eu cette erreur après avoir utilisé le package dotenv pour sécuriser ma clé de cryptage de base de données

mais proccess.env.SECRET travaille currectly

je suppose que mon problème est ici:

Error: Authentication code missing
    at Object.schema.methods.authenticateSync (C:\Users\Amir\Desktop\security\node_modules\mongoose-encryption\lib\plugins\mongoose-encryption.js:419:23)
    at model.<anonymous> (C:\Users\Amir\Desktop\security\node_modules\mongoose-encryption\lib\plugins\mongoose-encryption.js:239:47)
    at Kareem.execPreSync (C:\Users\Amir\Desktop\security\node_modules\kareem\index.js:115:16)
    at model.syncWrapper [as $__init] (C:\Users\Amir\Desktop\security\node_modules\kareem\index.js:232:12)
    at model.Document.init (C:\Users\Amir\Desktop\security\node_modules\mongoose\lib\document.js:513:8)
    at completeOne (C:\Users\Amir\Desktop\security\node_modules\mongoose\lib\query.js:2853:12)
    at model.Query.Query._completeOne (C:\Users\Amir\Desktop\security\node_modules\mongoose\lib\query.js:2094:7)
    at Immediate.<anonymous> (C:\Users\Amir\Desktop\security\node_modules\mongoose\lib\query.js:2138:10)
    at Immediate.<anonymous> (C:\Users\Amir\Desktop\security\node_modules\mquery\lib\utils.js:116:16)
    at processImmediate (internal/timers.js:456:21)

app.js:

require("dotenv").config();

const express = require("express");
const bodyParser = require("body-parser");
const ejs = require("ejs");
const mongoose = require("mongoose");
const encrypt = require("mongoose-encryption");

const app = express();

app.use(express.static("public"));
app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({ extended: true }));

mongoose.connect("mongodb://localhost:27017/userDB", {
    useUnifiedTopology: true,
    useNewUrlParser: true,
});

const userSchema = new mongoose.Schema({
    email: String,
    password: String,
});

                                         //_
//     encrypting password field         // | 
userSchema.plugin(encrypt, {             // | i guess problem is here
    secret: process.env.SECRET,          // |
    encryptedFields: ["password"],       //_|
});

const User = mongoose.model("User", userSchema);

Erreur :

userSchema.plugin(encrypt, {           
    secret: process.env.SECRET,         
    encryptedFields: ["password"],     
});