Fatal error: Uncaught Error: Call to a member function using_index_permalinks() on null in /www/wp-includes/rest-api.php:508 Stack trace: #0 /www/wp-includes/rest-api.php(571): get_rest_url() #1 /www/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(2784): rest_url() #2 /www/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(2729): WP_REST_Posts_Controller->get_schema_links() #3 /www/wp-includes/rest-api/endpoints/class-wp-rest-controller.php(388): WP_REST_Posts_Controller->get_item_schema() #4 /www/wp-includes/rest-api/endpoints/class-wp-rest-controller.php(343): WP_REST_Controller->get_context_param() #5 /www/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(2911): WP_REST_Controller->get_collection_params() #6 /www/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(83): WP_REST_Posts_Controller->get_collection_params() #7 /www/wp-includes/rest-api.php(274): WP_REST_Posts_Controller->register_routes() #8 /www/wp-includes/class-wp-hook.php(324): create_initial in /www/wp-includes/rest-api.php on line 508