There has been a critical error on this website. Please check your site admin email inbox for instructions.

A PHP fatal error stopped WordPress loading. Some sites show a blank white screen instead.

Why it happens

A plugin, theme or PHP compatibility problem caused a fatal error. WordPress sends instructions to the site admin email address.

How to fix it

1. 1

   Step 1

   Check the site admin email inbox for the message WordPress sent.

2. 2

   Step 2

   Turn on debugging in wp-config.php, reload the page, then read wp-content/debug.log to find the plugin or theme at fault.

3. 3

   Step 3

   If you cannot reach the admin screens, rename wp-content/plugins to plugins_old to deactivate all plugins, then reactivate them one at a time.

4. 4

   Step 4

   Turn debugging off again when you are done.

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );

Source

Full guide: How to migrate a WordPress site to a new host without downtime →