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:235 Stack trace: #0 /home/web13c/bistro.site/public_html/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/Support.php(258): MarkupMarkdown\Core\Support->content_data('\xE7\xB5\x90\xE6\xA7\x8B\xE6\x9B\xB8\xE3\x81\x8D\xE3\x81\x9F...', 1) #1 /home/web13c/bistro.site/public_html/wp-includes/class-wp-hook.php(324): MarkupMarkdown\Core\Support->post_content_mmd2html('\xE7\xB5\x90\xE6\xA7\x8B\xE6\x9B\xB8\xE3\x81\x8D\xE3\x81\x9F...') #2 /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) #3 /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...') #4 /home/web13c/bistro.site/public_html/wp-i in /home/web13c/bistro.site/public_html/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/Support.php on line 235