Strapi Error

I am trying to deploy a Strapi app to Heroku. I have set APP_KEYS and JWT_SECRET config vars in Heroku. I have also added this code to plugins.js as stated in this question. But I am still getting this error (see image). Can anyone help with this?

const crypto = require("crypto");

module.exports = ({ env }) => ({
  "users-permissions": {
    config: {
      jwtSecret: env("JWT_SECRET") || crypto.randomBytes(16).toString("base64"),
    },
  },
});