Exception encountered, of type &quot;Error&quot;<br />
[ee857053ea28ac9ef79ad3ae] /oss4art-wiki/api.php   Error from line 79 of /var/www/fukuchi.org/root/oss4art-wiki/vendor/wikimedia/html-formatter/src/HtmlFormatter.php: Class &quot;DOMDocument&quot; not found<br />
Backtrace:<br />
#0 /var/www/fukuchi.org/root/oss4art-wiki/includes/api/ApiHelp.php(174): HtmlFormatter\HtmlFormatter-&gt;getDoc()<br />
#1 /var/www/fukuchi.org/root/oss4art-wiki/includes/api/ApiHelp.php(155): ApiHelp::fixHelpLinks()<br />
#2 /var/www/fukuchi.org/root/oss4art-wiki/includes/api/ApiHelp.php(53): ApiHelp::getHelp()<br />
#3 /var/www/fukuchi.org/root/oss4art-wiki/includes/api/ApiMain.php(1362): ApiHelp-&gt;execute()<br />
#4 /var/www/fukuchi.org/root/oss4art-wiki/includes/api/ApiMain.php(474): ApiMain-&gt;executeAction()<br />
#5 /var/www/fukuchi.org/root/oss4art-wiki/includes/api/ApiMain.php(440): ApiMain-&gt;executeActionWithErrorHandling()<br />
#6 /var/www/fukuchi.org/root/oss4art-wiki/api.php(94): ApiMain-&gt;execute()<br />
#7 {main}<br />