我正在将我的项目切换到ES6，并将所有内联require替换为import。替换顶层的require没有问题，但是当我尝试替换内联的require时，我得到了TypeError: app.use() requires a middleware function

// We need these modules to be present.
import path from "path";
import dotEnv from "dotenv";
import express from "express";
import { fileURLToPath } from 'url';
import connectToDatabase from "./database.js";
import morganMiddleware from "./middlewares/morgan.middleware.js";

// Initialise exress
const app = express();

// Initialise dotEnv;
dotEnv.config();

// Define file and directory path
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Load environment variables
const PORT = process.env.PORT || 1313;

// Properly parse the json and urlencoed data
app.use(express.urlencoded({ extended: false }));
app.use(express.json());

// Add the morgan middleware
app.use(morganMiddleware);

// When we respond with a json object, indent every block with 4 spaces.
app.set("json spaces", 4);

// Where should we look for the static files
app.use(express.static(path.join(__dirname, "../public")));

//Load the different routes
app.use(import("./controllers/index.js"));

// Connect to database
connectToDatabase();

// Custom Error handling
app.use((req, res) => {
   res.status(404).json({
      type: "error",
      message: "404: Page not Found"});
});

app.use((error, req, res, next) => {
   res.status(500).json({
      type: "error",
      message: "500: Internal Server Error"});
});

// Start the server
app.listen(PORT, () => {
   console.log(`Server is running on port ${PORT}`);
});

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有人知道这是怎么回事吗？
这是controllers/index.js文件中的内容

// Loading the modules
import { Router } from "express";

const router = Router()

// Load the models
import ProjectsData, { addProject } from "../models/projects.js";

router.post("/", (req, res) => {
    res.send("Cool. We are working. Now you can proceed to cry.");
});

export default router;

型