why i am getting a "throw err" in this app.js file?

const express = require("express");

const app = express();

const jsonData = require("./jsonFile/data.json");



app.set("view engine", "ejs");



app.use(require("./routes/index"));

app.use(jsonData);



app.listen(3000, ()=>{

console.log("listening on port");

})



index.js file

const express = require("express");

const router = express.Router();

const jsonData = require("./jsonFile/data.json");



router.get("/index", (req, res)=>{

const retrieveData = jsonData.datafile;

res.render("index", {

retrieveData: retrieveData

});

});



module.exports = router;



finally the ejs file

<% retrieveData.forEach((data)=>{ %>



<h3><%= data.title %></h3>

<% }) %>