PHP:
Fatal error: Uncaught Error: Interface "SimplePie_Cache_Base" not found in /www/habi.gna.ch/doc/wp-includes/SimplePie/Cache/Memcache.php:57 Stack trace: #0 {main} thrown in /www/habi.gna.ch/doc/wp-includes/SimplePie/Cache/Memcache.php on line 57