ブログを作り直し。
Fatal error: Uncaught Error: Call to undefined function MarkupMarkdown\Core\wp_is_rest_endpoint() in /home/web13c/bistro.site/public_html/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/Support.php:204 Stack trace: #0 /home/web13c/bistro.site/public_html/wp-includes/class-wp-hook.php(324): MarkupMarkdown\Core\Support->post_markdown2html('\xE7\xB5\x90\xE6\xA7\x8B\xE6\x9B\xB8\xE3\x81\x8D\xE3\x81\x9F...') #1 /home/web13c/bistro.site/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('\xE7\xB5\x90\xE6\xA7\x8B\xE6\x9B\xB8\xE3\x81\x8D\xE3\x81\x9F...', Array) #2 /home/web13c/bistro.site/public_html/wp-content/themes/luxeritas/inc/filters.php(292): apply_filters('the_content', '\xE7\xB5\x90\xE6\xA7\x8B\xE6\x9B\xB8\xE3\x81\x8D\xE3\x81\x9F...') #3 /home/web13c/bistro.site/public_html/wp-includes/class-wp-hook.php(324): {closure}('\xE7\xB5\x90\xE6\xA7\x8B\xE6\x9B\xB8\xE3\x81\x8D\xE3\x81\x9F...') #4 /home/web13c/bistro.site/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('', Array) #5 /home/web13c/ in /home/web13c/bistro.site/public_html/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/Support.php on line 204