Fatal error: Uncaught Error: Call to undefined function wp_is_block_theme() in /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-content/plugins/wp-hotel-booking/includes/abstracts/class-wphb-abstract-block-template.php:27 Stack trace: #0 /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-content/plugins/wp-hotel-booking/includes/templates/class-wphb-block-template-archive.php(15): AbstractBlockTemplate->__construct() #1 /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-content/plugins/wp-hotel-booking/includes/templates/class-wphb-block-template-archive.php(29): BlockTemplateArchiveProperty->__construct() #2 /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-content/plugins/wp-hotel-booking/includes/class-wphb-block-template-config.php(33): require_once('/homepages/46/d...') #3 /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-includes/class-wp-hook.php(303): Block_Template_Config->add_includes('') #4 /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-includes/class-wp-hook.php(327): WP_H in /homepages/46/d752538854/htdocs/clickandbuilds/sonne/wp-content/plugins/wp-hotel-booking/includes/abstracts/class-wphb-abstract-block-template.php on line 27