Fatal error: Uncaught Error: Call to undefined function wp_is_serving_rest_request() in /export/sd09/www/jp/r/e/gmoserver/5/9/sd0143659/mec-solution.jp/wordpress-4.4.1-ja-jetpack-undernavicontrol/wp-includes/rest-api.php:3413 Stack trace: #0 /export/sd09/www/jp/r/e/gmoserver/5/9/sd0143659/mec-solution.jp/wordpress-4.4.1-ja-jetpack-undernavicontrol/wp-includes/script-loader.php(2590): wp_is_rest_endpoint() #1 /export/sd09/www/jp/r/e/gmoserver/5/9/sd0143659/mec-solution.jp/wordpress-4.4.1-ja-jetpack-undernavicontrol/wp-includes/blocks/index.php(29): wp_should_load_separate_core_block_assets() #2 /export/sd09/www/jp/r/e/gmoserver/5/9/sd0143659/mec-solution.jp/wordpress-4.4.1-ja-jetpack-undernavicontrol/wp-includes/class-wp-hook.php(324): register_core_block_style_handles('') #3 /export/sd09/www/jp/r/e/gmoserver/5/9/sd0143659/mec-solution.jp/wordpress-4.4.1-ja-jetpack-undernavicontrol/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(Object(WPMailSMTP\Tasks\Tasks), Array) #4 /export/sd09/www/jp/r/e/gmoserver/5/9/sd01 in /export/sd09/www/jp/r/e/gmoserver/5/9/sd0143659/mec-solution.jp/wordpress-4.4.1-ja-jetpack-undernavicontrol/wp-includes/rest-api.php on line 3413