Catchable fatal error: Argument 1 passed to Zend_Search_Lucene_LockManager::obtainReadLock() must be an instance of Zend_Search_Lucene_Storage_Directory, boolean given, called in /var/www/library/Zend/Search/Lucene.php on line 527 and defined in /var/www/library/Zend/Search/Lucene/LockManager.php on line 132