I have a problem at backend. I receive this message and error 500, when trying to save an order.

[sgyaa]

index.php/admin/sales_order_create/save/key/d8c66cccbe3dd192dc76c9c44be581c3/

How can I debug, what causes this error? 

[Gabriel Guarino · Accepted solution]

Hi @sgyaa,

You should enable display_errors and developer mode in Magento:

In order to turn on error reporting you should: 

a) Open index.php and un-comment the following line

Display Errors

#ini_set('display_errors', 1);

b) Open .htaccess and add the following line at the end:

Developer Mode

SetEnv MAGE_IS_DEVELOPER_MODE "true"

Also, make sure to review the apache error log since the error 500 is an internal error from the server.

Best regards.
Gabriel