What does error message "There has been a critical error on your website. Please check your site admin email inbox for instructions." mean and how can I solve and fix it.
WordPress
*. Delete last plugin or theme you installed before seeing this error.
*. Delete all plugins.
*. Delete all themes except the default one.
*. Increase your site's PHP Memory Limit by adding "define( 'WP_MEMORY_LIMIT', '512M' );" into your wp-config.php file. If you don't know how to do it then ask your hosting support.
*. Upgrade your site's PHP version. If you don't know how to do it then ask your hosting support.