Having problem with blank page on prestashop !

[Valdrin]

 

Notice: Undefined variable: forum_url_tab in /home/valdrins/

public_html/valdrin.com/modules/pm_advancedtopmenu/

pm_advancedtopmenu.php on line 90

 

Warning: Cannot modify header information - 

headers already sent by 

(output started at /home/valdrins/public_html/

valdrin.com/modules/pm_advancedtopmenu/

pm_advancedtopmenu.php:90) in /home/valdrins/

public_html/valdrin.com/classes/controller/

AdminController.php on line 1208

 

"I have this problem when i try to save something or i change an product and it goes blank 

when i set define('_PS_MODE_DEV_', false to true it shows me that problem above .

Please can anybody help how to fix this problem !

[Kogkalidis]

Disable pm_advancedtopmenu module and let us know.

[Valdrin]

I desable pm_advancedtopmenu module and again it goes blank it is shows me this problem:

 

Warning: Cannot modify header information - headers already sent by (output started at /home/valdrins/public_html/valdrin.com/classes/Product.php:1) in /home/valdrins/public_html/valdrin.com/classes/controller/AdminController.php on line 1208

[NemoPS]

Looks like product.php has some white space at the very top, check that out, the php tag should be the very first content of the file

[Valdrin]

where is the problem here because i dont see it

 

<?php

/* 2014 - PAZAR */

/**

 * This file will be removed in 1.6

 * You have to use index.php?controller=page_name instead of this page

 *

 * @deprecated 1.5.0

 */

 

require(dirname(__FILE__).'/config/config.inc.php');

Tools::displayFileAsDeprecated();

 

Tools::redirect('index.php?controller=product'.((count($_GET) || count($_POST)) ? '&'.http_build_query(array_merge($_GET, $_POST), '', '&') : ''), __PS_BASE_URI__, null, 'HTTP/1.1 301 Moved Permanently');

[NemoPS]

That does not seem product.php, the file I mention is inside classes/

[Valdrin]

Thank you very much NemoPS you are the best.

It was inside classes.

And i fix it.

It was some white space at the very top.

 

Thanks again.