DOMDocument' not found

[thatsawan]

Fatal error: Class 'aaa\m_button_like\acp\DOMDocument' not found in /opt/lampp/htdocs/phpbb5/ext/aaa/m_button_like/acp/feed.php on line 44

Code: Select all

<?php
    namespace aaa\m_button_like\acp;
    class feed { 
    //
    } 

Code: Select all

  $feed = new \aaa\m_button_like\acp\feed;
 $feed->main($xml,$xml_ads);