Magento Functional Testing Framework

i am trying to install Magento Functional Testing Framework with the help of https://devdocs.magento.com/mftf/2.3/getting-started.html ,when i run vendor/bin/mftf build:project

i got this error

PHP Warning: require_once(/var/www/html/magento2): failed to open stream: No such file or directory in /var/www/html/magento2/vendor/bin/mftf on line 21 PHP Fatal error: require_once(): Failed opening required '' (include_path='.:/usr/share/php') in /var/www/html/magento2/vendor/bin/mftf on line 21

vendor/bin/mftf.php code

#!/usr/bin/env php


<?
 php 
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
if (PHP_SAPI !== 'cli') {
    echo 'bin/mftf must be run as a CLI application';
    exit(1);

}

$autoloadPath = realpath(__DIR__ . '/../../../autoload.php'); 
$testBootstrapPath = realpath(__DIR__ . '/../dev/tests/functional/standalone_bootstrap.php'); 

try {
    if (file_exists($autoloadPath)) {
        require_once $autoloadPath;
    } else {
        require_once $testBootstrapPath;
        //require_once ( 'db/config.php');
       // require_once __DIR__ . '/vendor/bin/mftf';

    }  
} catch (\Exception $e) {
    echo 'Autoload error: ' . $e->getMessage();
    exit(1);
}    


try {
    $application = new Symfony\Component\Console\Application();
    $application->setName('Magento Functional Testing Framework CLI');
    $application->setVersion('2.3.8');
    /** @var \Magento\FunctionalTestingFramework\Console\CommandListInterface $commandList */
    $commandList = new \Magento\FunctionalTestingFramework\Console\CommandList;
    foreach ($commandList->getCommands() as $command) {
        $application->add($command);
        }
        $application->run();
    } catch (\Exception $e) {
        while ($e) {      
            echo $e->getMessage();
            echo $e->getTraceAsString();
        echo "\n\n";
        $e = $e->getPrevious();
    }
    exit(1);
}