Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/html/phpBB3/vendor/s9e/text-formatter/src/Renderer.php:18 Stack trace: #0 /var/www/html/phpBB3/vendor/s9e/text-formatter/src/Renderers/PHP.php(127): s9e\TextFormatter\Renderer->loadXML('<r><B>Youtube: ...') #1 /var/www/html/phpBB3/vendor/s9e/text-formatter/src/Renderer.php(27): s9e\TextFormatter\Renderers\PHP->renderRichText('<r><B>Youtube: ...') #2 /var/www/html/phpBB3/phpbb/textformatter/s9e/renderer.php(250): s9e\TextFormatter\Renderer->render('<r><B><s>[b]</s...') #3 /var/www/html/phpBB3/includes/functions_content.php(600): phpbb\textformatter\s9e\renderer->render('<r><B><s>[b]</s...') #4 /var/www/html/phpBB3/viewtopic.php(1652): generate_text_for_display('<r><B><s>[b]</s...', '', '', 2, true) #5 {main} thrown in /var/www/html/phpBB3/vendor/s9e/text-formatter/src/Renderer.php on line 18