Cake PHP show Internal Server Error 500 : Following cake php code is in index.php file when it runs on server it shows internal server error 500.

  
  <?php
    
    if (!defined('DS')) {
    	define('DS', DIRECTORY_SEPARATOR);
    }
    
    
    if (!defined('ROOT')) {
    	define('ROOT', dirname(dirname(dirname(__FILE__))));
    }
    
    if (!defined('APP_DIR')) {
    	define('APP_DIR', basename(dirname(dirname(__FILE__))));
    }
    
    $vendorPath = ROOT . DS . APP_DIR . DS . 'Vendor' . DS . 'cakephp' . DS . 'cakephp' . DS . 'lib';
    $dispatcher = 'Cake' . DS . 'Console' . DS . 'ShellDispatcher.php';
    if (!defined('CAKE_CORE_INCLUDE_PATH') && file_exists($vendorPath . DS . $dispatcher)) {
    	define('CAKE_CORE_INCLUDE_PATH', $vendorPath);
    }
    
    if (!defined('WEBROOT_DIR')) {
    	define('WEBROOT_DIR', basename(dirname(__FILE__)));
    }
    if (!defined('WWW_ROOT')) {
    	define('WWW_ROOT', dirname(__FILE__) . DS);
    }
    
    if (php_sapi_name() === 'cli-server') {
    	if ($_SERVER['REQUEST_URI'] !== '/' && file_exists(WWW_ROOT . $_SERVER['PHP_SELF'])) {
    		return false;
    	}
    	$_SERVER['PHP_SELF'] = '/' . basename(__FILE__);
    }
    
    if (!defined('CAKE_CORE_INCLUDE_PATH')) {
    	if (function_exists('ini_set')) {
    		ini_set('include_path', ROOT . DS . 'lib' . PATH_SEPARATOR . ini_get('include_path'));
    	}
    	if (!include 'Cake' . DS . 'bootstrap.php') {
    		$failed = true;
    	}
    } else {
    	if (!include CAKE_CORE_INCLUDE_PATH . DS . 'Cake' . DS . 'bootstrap.php') {
    		$failed = true;
    	}
    }
    if (!empty($failed)) {
    	trigger_error("CakePHP core could not be found. Check the value of CAKE_CORE_INCLUDE_PATH in APP/webroot/index.php. It should point to the directory containing your " . DS . "cake core directory and your " . DS . "vendors root directory.", E_USER_ERROR);
    }
    
    App::uses('Dispatcher', 'Routing');
    
    $Dispatcher = new Dispatcher();
    $Dispatcher->dispatch(
    	new CakeRequest(),
    	new CakeResponse()
    );

Cake PHP show Internal Server Error 500
Cake PHP show Internal Server Error 500
Cake PHP show Internal Server Error 500