为什么我在后台收到错误“Route.post()需要回调函数,但得到了一个[object Undefined]”?

我正在建立一个电子商务网页,现在正在处理支付部分。我已经创建了控制器和路由器,但出现了错误

Error: Route.post() requires a callback function but got a [object Undefined]
    at Route.<computed> [as post] (F:\zebrow_mern\node_modules\express\lib\router\route.js:211:15)
    at Object.<anonymous> (F:\zebrow_mern\backend\routes\paymentRouter.js:9:34)
    at Module._compile (node:internal/modules/cjs/loader:1159:14)

这是我的控制器

const catchAsyncErrors = require("../middleware/catchAsyncError");

const stripe = require("stripe")(process.env.STRIPE_SECRET_KEY);

const processPayment = catchAsyncErrors(async (req, res, next) => {
  const myPayment = await stripe.paymentIntents.create({
    amount: req.body.amount,
    currency: "inr",
    metadata: {
      company: "Zebrow",
    },
  });

  res
    .status(200)
    .json({ success: true, client_secret: myPayment.client_secret });
});

exports.sendStripeApiKey = catchAsyncErrors(async (req, res, next) => {
  res.status(200).json({ stripeApiKey: process.env.STRIPE_API_KEY });
});
module.exports = {processPayment}

路由器文件

const express = require("express");
const {
  processPayment,
  sendStripeApiKey,
} = require("../controllers/paymentController");
const router = express.Router();
const { isAuthenticatedUser } = require("../middleware/auth");

router.route("/payment/process").post(isAuthenticatedUser, processPayment);

router.route("/stripeapikey").get(isAuthenticatedUser, sendStripeApiKey);

module.exports = router;