Custom Database (MongoDB Altas) script template In signup user doesn't get created get an error

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same problem

function create(user, callback) {
const bcrypt = require(‘bcrypt’);
const {MongoClient} = require(“mongodb@3.1.4”);
const dbUser = configuration.DB_USR;
const dbPwd = configuration.DB_PSWRD;
const dbHost = configuration.DB_HOST;
const dbName = configuration.CLIENT_DB;
const usersCollection = configuration.USER_COLLECTION;

const uri = mongodb+srv://${dbUser}:${dbPwd}@${dbHost}/test?retryWrites=true;
const client = new MongoClient(uri, { useNewUrlParser: true });

client.connect(function (err) {
if (err) return callback(err);

const db = client.db(dbName);
const users = db.collection(usersCollection);

users.findOne({ email: user.email }, function (err, withSameMail) {
  if (err || withSameMail) {
    client.close();
    return callback(err || new Error('the user already exists'));
  }

  bcrypt.hash(user.password, 10, function (err, hash) {
    if (err) {
      client.close();
      return callback(err);
    }

    user.password = hash;
    users.insert(user, function (err, inserted) {
      client.close();

      if (err) return callback(err);
      callback(null);
    });
  });
});

});
}