Warning: Class "\dokuwiki\Feed\FeedParser" not found in /usr/share/dokuwiki/inc/legacy.php on line 23

Fatal error: Uncaught Error: Class "SimplePie\SimplePie" not found in /usr/share/php/php-simplepie/SimplePie.php:26 Stack trace: #0 /usr/share/dokuwiki/vendor/composer/ClassLoader.php(576): include() #1 /usr/share/dokuwiki/vendor/composer/ClassLoader.php(427): {closure:Composer\Autoload\ClassLoader::initializeIncludeClosure():575}() #2 /usr/share/dokuwiki/inc/Feed/FeedParser.php(11): Composer\Autoload\ClassLoader->loadClass() #3 /usr/share/dokuwiki/inc/load.php(224): require('...') #4 /usr/share/dokuwiki/inc/load.php(103): class@anonymous->autoloadCoreClass() #5 [internal function]: class@anonymous->autoload() #6 /usr/share/dokuwiki/inc/legacy.php(23): class_alias() #7 /usr/share/dokuwiki/inc/load.php(82): require_once('...') #8 /usr/share/dokuwiki/inc/load.php(71): class@anonymous->loadCommonLibs() #9 /usr/share/dokuwiki/inc/load.php(13): class@anonymous->__construct() #10 /usr/share/dokuwiki/inc/init.php(206): require_once('...') #11 /usr/share/dokuwiki/doku.php(38): require_once('...') #12 {main} thrown in /usr/share/php/php-simplepie/SimplePie.php on line 26