Fatal error: Uncaught Error: Class 'WP_Theme_JSON_Resolver' not found in /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jetpack_webfont-undernavicontrol/wp-includes/theme-templates.php:212
Stack trace:
#0 /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-hook.php(307): wp_enable_block_templates('')
#1 /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#2 /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jetpack_webfont-undernavicontrol/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#3 /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jetpack_webfont-undernavicontrol/wp-settings.php(530): do_action('setup_theme')
#4 /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jet in /export/sd09/www/jp/r/e/gmoserver/8/6/sd0156286/hayakawadc.com/wordpress-5.7.2-ja-jetpack_webfont-undernavicontrol/wp-includes/theme-templates.php on line 212