Warning: require_once(/opt/site/wordpress/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/class-activation.php): Failed to open stream: No such file or directory in /opt/site/wordpress/wp-content/plugins/markup-markdown/markup-markdown.php on line 99

Fatal error: Uncaught Error: Failed opening required '/opt/site/wordpress/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/class-activation.php' (include_path='.:/usr/local/lib/php') in /opt/site/wordpress/wp-content/plugins/markup-markdown/markup-markdown.php:99 Stack trace: #0 /opt/site/wordpress/wp-content/plugins/markup-markdown/markup-markdown.php(414): Markup_Markdown->__construct() #1 /opt/site/wordpress/wp-content/plugins/markup-markdown/markup-markdown.php(429): Markup_Markdown_Instance::instance() #2 /opt/site/wordpress/wp-content/plugins/markup-markdown/markup-markdown.php(432): markup_markdown() #3 /opt/site/wordpress/wp-settings.php(597): include_once('/opt/site/wordp...') #4 /opt/site/wordpress/wp-config.php(94): require_once('/opt/site/wordp...') #5 /opt/site/wordpress/wp-load.php(50): require_once('/opt/site/wordp...') #6 /opt/site/wordpress/wp-blog-header.php(13): require_once('/opt/site/wordp...') #7 /opt/site/wordpress/index.php(17): require('/opt/site/wordp...') #8 {main} thrown in /opt/site/wordpress/wp-content/plugins/markup-markdown/markup-markdown.php on line 99