无法使用Wordpress 5.0隐藏错误消息

Our Wordpress was updated to 5.0 overnight, and we now have an error message showing at the top of all webpages:

Everything still works accordingly, and I really just need to hide the error code, but since the update it seems the warning message can't be hidden. I have the following code already added to my wp-config.php file:

 ini_set('log_errors','On');
 ini_set('display_errors','Off');
 ini_set('error_reporting', E_ALL );
 define('WP_DEBUG', false);
 define('WP_DEBUG_LOG', true);
 define('WP_DEBUG_DISPLAY', false);

But I am still seeing the following error code:

Warning: Declaration of WC_Product_Booking::get_price() should be compatible with WC_Product::get_price($context = 'view') in /public_html/wp-content/plugins/woocommerce-bookings/includes/class-wc-product-booking.php on line 0

How can I hide this? Did 5.0 remove the ability to hide error codes?

Try setting error_reporting to 0 instead of E_ALL and see if it works

 ini_set('error_reporting', 0);