After updating to latest WordPress version 5.9 it can happen that you get a blank white page or a fatal error saying something like: [26-Jan-2022 15:52:28 UTC] PHP Fatal error: Uncaught Error: Call to undefined function get_allowed_block_template_part_areas() in /home/web/public_html/new/wp-includes/blocks/template-part.php:168 If you only get a white page without seeing anything, you can verify this error by … Continue reading “Fix: Call to undefined function get allowed block template part areas()”