Error: Route.get() requires a callback function but got a [object Object] due to middleware

Question

I add some middlewares in route and got this error :

const crypto = require("crypto");
const isAuthenticated = require("../Middleware/auth.js");

const router = express.Router();

router.get("/:prodeuctId", isAuthenticated, (req, res, next) => {
 // code ...
});

Error is following :

       throw new Error(msg);
    ^

Error: Route.get() requires a callback function but got a [object Object] at Route. [as get] (C:\Users\Nayab\Desktop\AxxoCare\backend\node_modules\express\lib\router\route.js:211:15) at proto. [as get] (C:\Users\Nayab\Desktop\AxxoCare\backend\node_modules\express\lib\router\index.js:521:19) at Object. (C:\Users\Nayab\Desktop\AxxoCare\backend\Controllers\userController.js:291:8) at Module._compile (node:internal/modules/cjs/loader:1254:14) at Module._extensions..js (node:internal/modules/cjs/loader:1308:10) at Module.load (node:internal/modules/cjs/loader:1117:32) at Module._load (node:internal/modules/cjs/loader:958:12) at Module.require (node:internal/modules/cjs/loader:1141:19) at require (node:internal/modules/cjs/helpers:110:18) at Object. (C:\Users\Nayab\Desktop\AxxoCare\backend\App.js:3:14)