function error

<?php
final class Logger {
	private $filename;
	public function __construct($filename) {
		$this->filename = $filename;
	}
	public function write($message) {
		$file = DIR_LOGS . $this->filename; 
		$handle = fopen($file, 'a+'); 
		fwrite($handle, date('Y-m-d G:i:s') . ' - ' . $message . "\n");	
		fclose($handle);
	} 	
}
?>

<?php 
class ControllerAccountSuccess extends Controller {  
	public function index() {
    	$this->language->load('account/success');
  
    	$this->document->title = $this->language->get('heading_title');


		$this->document->breadcrumbs = array();


      	$this->document->breadcrumbs[] = array(
        	'href'      => $this->url->http('common/home'),
        	'text'      => $this->language->get('text_home'),
        	'separator' => FALSE
      	); 


      	$this->document->breadcrumbs[] = array(
        	'href'      => $this->url->http('account/account'),
        	'text'      => $this->language->get('text_account'),
        	'separator' => $this->language->get('text_separator')
      	);


      	$this->document->breadcrumbs[] = array(
        	'href'      => $this->url->http('account/success'),
        	'text'      => $this->language->get('text_success'),
        	'separator' => $this->language->get('text_separator')
      	);


    	$this->data['heading_title'] = $this->language->get('heading_title');


		if (!$this->config->get('config_customer_approval')) {
    		$this->data['text_message'] = sprintf($this->language->get('text_message'), $this->url->http('information/contact'));
		} else {
			$this->data['text_message'] = sprintf($this->language->get('text_approval'), $this->config->get('config_store'), $this->url->http('information/contact'));
		}
		
    	$this->data['button_continue'] = $this->language->get('button_continue');
		
		if ($this->cart->hasProducts()) {
			$this->data['continue'] = $this->url->http('checkout/cart');
		} else {
			$this->data['continue'] = $this->url->http('account/account');
		}
		
		if (file_exists(DIR_TEMPLATE . $this->config->get('config_template') . '/template/common/success.tpl')) {
			$this->template = $this->config->get('config_template') . '/template/common/success.tpl';
		} else {
			$this->template = 'default/template/common/success.tpl';
		}
		
		$this->children = array(
			'common/header',
			'common/footer',
			'common/column_left',
			'common/column_right'
		);
		
		$this->response->setOutput($this->render(TRUE), $this->config->get('config_compression'));				
  	}
}
?>