Приложение MERN падает на производстве при попытке сделать вызовы API (Heroku)

Question

Я развернул приложение MERN на heroku. Я могу получить доступ к целевой странице и перемещаться по страницам, но когда я пытаюсь позвонить на маршруты API на сервере, приложение вылетает. Локально приложение работает отлично. проблема возникает в производстве.

это мой сервер. js файл:

const express = require("express");
const app = express();
const connectDB = require("./config/db");
const path = require("path");

// Connect DB
connectDB();

// Init Middleware
app.use(express.json({ extended: false }));

app.use("/api/auth", require("./routes/api/auth"));
app.use("/api/users", require("./routes/api/users"));
app.use("/api/clientes", require("./routes/api/clientes"));
app.use("/api/local", require("./routes/api/local"));

if (process.env.NODE_ENV === "production") {
  app.use(express.static("client/usuarios/build"));
  app.get("*", (req, res) => {
    res.sendFile(
      path.resolve(__dirname, "client", "usuarios", "build", "index.html")
    );
  });
}
const PORT = process.env.PORT || 5000;

app.listen(PORT, () => console.log(`Server started on port ${PORT}`));

А это пакет . json:

{
  "name": "mercado",
  "version": "1.0.0",
  "description": "App de compras",
  "main": "server.js",
  "scripts": {
    "start": "node server",
    "server": "nodemon server",
    "usuarios": "npm start --prefix client/usuarios",
    "locales": "npm start --prefix client/locales",
    "dev-usuarios": "concurrently \"npm run server\" \"npm run usuarios\"",
    "heroku-postbuild": "NPM_CONFIG_PRODUCTION=false npm install --prefix client/usuarios && npm    run build --prefix client/usuarios"
  },
  "dependencies": {
    "aws-sdk": "^2.649.0",
    "bcryptjs": "^2.4.3",
    "config": "^3.3.1",
    "cors": "^2.8.5",
    "express": "^4.17.1",
    "express-validator": "^6.4.0",
    "jsonwebtoken": "^8.5.1",
    "mongoose": "^5.9.7",
    "multer": "^1.4.2",
    "multer-s3": "^2.9.0"
  },
  "devDependencies": {
    "concurrently": "^5.1.0",
    "nodemon": "^2.0.2"
  }
}

А это логи герою

2020-04-23T22:48:30.863113+00:00 heroku[web.1]: State changed from starting to up
2020-04-23T22:48:30.803402+00:00 app[web.1]: Server started on port 15776
2020-04-23T22:49:00.874382+00:00 app[web.1]: connection <monitor> to 52.205.15.208:27017 closed
2020-04-23T22:49:00.882434+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2020-04-23T22:49:00.882662+00:00 app[web.1]: npm ERR! errno 1
2020-04-23T22:49:00.883614+00:00 app[web.1]: npm ERR! mercado@1.0.0 start: `node server`
2020-04-23T22:49:00.883721+00:00 app[web.1]: npm ERR! Exit status 1
2020-04-23T22:49:00.883871+00:00 app[web.1]: npm ERR! 
2020-04-23T22:49:00.883979+00:00 app[web.1]: npm ERR! Failed at the mercado@1.0.0 start script.
2020-04-23T22:49:00.884050+00:00 app[web.1]: npm ERR! This is probably not a problem with npm.   There is likely additional logging output above.
2020-04-23T22:49:00.891636+00:00 app[web.1]: 
2020-04-23T22:49:00.891892+00:00 app[web.1]: npm ERR! A complete log of this run can be found   in:
2020-04-23T22:49:00.892035+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2020-04-23T22_49_00_884Z-debug.log
2020-04-23T22:49:00.965661+00:00 heroku[web.1]: State changed from up to crashed