How to integrate TCPDF on CI4 as Library

I am trying to integrate TCPDF on CI4. while integrating, it throws 

What I have done so far is 
1) Pasted tcpdf folder in library folder
2) Created "Tpdf.php" in library folder (code below)

Code:

<?php

namespace App\Libraries;

require_once APPPATH.'/libraries/tcpdf/tcpdf.php';

class Tpdf extends TCPDF
{
    public function __construct()
    {
        parent::__construct();
    }
}

3) I called TCPDF in "home controller" (code below)

Code:

<?php
namespace App\Controllers;

use App\Models\UserModel;
use App\Libraries\Tpdf;

class Home extends BaseController
{
    public $tcpdf;
    function __construct()
    {
        $this->userModel = new UserModel();
        $this->tpdf = new Tpdf();
    }

After that I am getting error as shown in attached image

Please suggest the solution.

Attached Files

Thumbnail(s)
   

On the example page they say to include tcpdf_include.php:

PHP Code:

// Include the main TCPDF library (search for installation path).
require_once('tcpdf_include.php'); 


Also, it’s not what cause this error, but you declared a $tcpdf variable but you assign the new object to $tpdf.

CodeIgniter 4 tutorials (EN/FR) - https://includebeer.com
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I corrected the wrong like you mentioned and still it throws the same error

I corrected the wrong like you mentioned and still it throws the same error

The correct way to use the library was mentioned in https://forum.codeigniter.com/thread-75463.html

I had such a problem with PHPSpreadsheet; such a problem was resolved when I used composer to download the library. Hope this can help you.

Use a backslash on TCPDF.

class Tpdf extends \TCPDF
{
...
}