Who doesn’t know the situation? Something is going wrong with WordPress. With the configuration, a plugin or a theme and you ask the support community asks for error messages.
To receive those messages in WordPress, you can activate
WP_DEBUG. Setting it to the value
TRUE causes WordPress (or better PHP) to document all errors in the browser.
Doing so on a productive website might look – hm – not good. What to do?
Logging error messages
With the following lines, added to the
wp-config.php, you can log all the errors in a file instead of getting it in the browser:
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_DISPLAY', false );
define( 'WP_DEBUG_LOG', true );