Edit order page problem

[magentodag]

Hello,

i'm using 1.9.3.6. When i try to edit an order in processing status, i see a blank page without any details, just the sidebar on the left :

In which way i can fix the problem?

Thank you

[Sunil Patel]

Hello @magentodag

ini_set('display_errors', 1);ini_set('display_startup_errors', 1);error_reporting(E_ALL);

 Please add above code into index.php and check that page source ,so it will get error.

[magentodag]

Hello,
Thank you for your reply.

I have added the code but nothing happens.

Thanks

[Damian Culotta]

Hi @magentodag,

Can you enable the Magento's logs?

It seems you are getting an error (maybe you should need to look at the webserver error logs too).

Something is failing and the page isn't loading but we need some error message or clue.

[magentodag]

Hi @Damian Culotta,

In var/log/system.log I see 

Warning: SimpleXMLElement::__construct():               ^  in /home/username/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173

Thanks

[Damian Culotta]

Hi @magentodag,

That error, probably, is related with a 3rd-party module sending a broken XML for notifications but is shoundn't be the reason (I guess).

What about the webserver error log?

[Sunil Patel]

Hello @magentodag

Try to disable all custom module and check it.

[magentodag]

Hi,

i'm trying to disable all modules from System -> Configuration -> Advanced and now i can't see nothing in my backend. In wich way i can enable all again?

Thank you

[Damian Culotta]

Hi @magentodag,

Can you access to the database and edit the core_config_data table?

If you can you should change these values:

Search for values starting with "advanced/modules_disbale_output/" and set the value to 0 when the value is 1.

Then clean cache and you should be able to continue.