Fatal error: Uncaught Error: Call to undefined function add_filter() in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\jetpack\extensions\extended-blocks\core-cover\core-cover.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\jetpack\extensions\extended-blocks\core-cover\core-cover.php on line 9