Fatal error: Uncaught Error: Call to undefined function get_classic_theme_supports_block_editor_settings() in /export/sd08/www/jp/r/e/gmoserver/0/6/sd0114606/crepinc.co.jp/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-theme-json-resolver.php:289
Stack trace:
#0 /export/sd08/www/jp/r/e/gmoserver/0/6/sd0114606/crepinc.co.jp/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-theme-json-resolver.php(574): WP_Theme_JSON_Resolver::get_theme_data()
#1 /export/sd08/www/jp/r/e/gmoserver/0/6/sd0114606/crepinc.co.jp/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/script-loader.php(3240): WP_Theme_JSON_Resolver::get_merged_data()
#2 /export/sd08/www/jp/r/e/gmoserver/0/6/sd0114606/crepinc.co.jp/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/script-loader.php(3436): {closure}()
#3 /export/sd08/www/jp/r/e/gmoserver/0/6/sd0114606/crepinc.co.jp/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-hook.php(308): {closure}('')
#4 /export/sd in /export/sd08/www/jp/r/e/gmoserver/0/6/sd0114606/crepinc.co.jp/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-theme-json-resolver.php on line 289