Code Deploy {Error: Cannot find module}

I am working on a mini project on CI/CD pipeline. I am working on a basic nodejs code and deploying it on EC2 server using pipeline. The code works fine locally but the pipeline fails in code deploy part. I have installed Node, Npm, Code deploy agent in ec2 and attached the required roles as well in both ec2 and code deploy. The error come in application_start phase

Nodejs-project

const express = require('express');
const app = express();

const { readFile } = require('fs').promises;
const path = require('path'); // Add this line

app.use(express.static(path.join(__dirname, 'public'))); // Serve static files

app.get('/', async (request, response) => {
    response.send(await readFile('./public/home.html', 'utf8')); // Update the path
});

app.listen(process.env.PORT || 3000, () => console.log(`App available on http://localhost:3000`))

Appspec.yml

version: 0.0
os: linux

files:
  - source: /
    destination: /home/ubuntu

hooks:
  BeforeInstall:
    - location: scripts/before_install.sh
      timeout: 200
      runas: root

  ApplicationStart:
    - location: scripts/application_start.sh
      timeout: 200
      runas: root

before_install.sh

# Install Node.js dependencies
npm ls
npm install express

application_start.sh

#node index.js
 node .

ERROR

LifecycleEvent - ApplicationStart
Script - scripts/application_start.sh
[stderr]internal/modules/cjs/loader.js:818
[stderr] throw err;
[stderr] ^
[stderr]
[stderr]Error: Cannot find module '/opt/codedeploy-agent'
[stderr] at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15)
[stderr] at Function.Module._load (internal/modules/cjs/loader.js:667:27)
[stderr] at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
[stderr] at internal/main/run_main_module.js:17:47 {
[stderr] code: 'MODULE_NOT_FOUND',
[stderr] requireStack: []
[stderr]}