Fatal error: Uncaught Error: Call to undefined function tribe_is_event() in /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-content/plugins/event-tickets/src/Tribe/REST/V1/Headers/Base.php:95 Stack trace: #0 /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-content/plugins/event-tickets/common/src/Tribe/REST/Headers/Supported.php(39): Tribe__Tickets__REST__V1__Headers__Base->get_rest_url() #1 /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-content/plugins/event-tickets/common/vendor/lucatume/di52/src/tad/DI52/closuresSupport.php(24): Tribe__REST__Headers__Supported->send_header('') #2 /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-includes/class-wp-hook.php(286): {closure}('') #3 /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #4 /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-includes/plugin.php(453): WP_Hook->do_action(Arra in /homepages/33/d666707112/htdocs/clickandbuilds/FeuerwehrWaldenburg/wp-content/plugins/event-tickets/src/Tribe/REST/V1/Headers/Base.php on line 95