Debug mode

In order to be able to see error messages, you need to enable the debug mode

In 1.6:

• Open the file /config/defines.inc.php
• Replace
  
  define('_PS_MODE_DEV_', false);

  1	define('_PS_MODE_DEV_', false);

  
  With
  
  define('_PS_MODE_DEV_', true);

  1	define('_PS_MODE_DEV_', true);

  
   

In 1.7:

• Open the page Advanced Parameters > Performance and enable Debug mode