Fatal error: Uncaught exception 'Zend_Search_Lucene_Exception' with message 'fopen(/var/lucene/cercalavoro/_fni.sti) [<a href='function.fopen'>function.fopen</a>]: failed to open stream: Too many open files' in /usr/share/pear/Zend/Search/Lucene/Storage/File/Filesystem.php:69 Stack trace: #0 /usr/share/pear/Zend/Search/Lucene/Storage/Directory/Filesystem.php(359): Zend_Search_Lucene_Storage_File_Filesystem->__construct('/var/lucene/cer...') #1 /usr/share/pear/Zend/Search/Lucene/Index/SegmentInfo.php(554): Zend_Search_Lucene_Storage_Directory_Filesystem->getFileObject('_fni.sti') #2 /usr/share/pear/Zend/Search/Lucene/Index/SegmentInfo.php(600): Zend_Search_Lucene_Index_SegmentInfo->_loadDictionaryIndex() #3 /usr/share/pear/Zend/Search/Lucene.php(999): Zend_Search_Lucene_Index_SegmentInfo->getTermInfo(Object(Zend_Search_Lucene_Index_Term)) #4 /usr/share/pear/Zend/Search/Lucene/Search/Query/MultiTerm.php(204): Zend_Search_Lucene->hasTerm(Object(Zend_Search_Lucene_Index_Term)) #5 /usr/share/pear/Zend/Search/Lucene.php(792): Z in /usr/share/pear/Zend/Search/Lucene/Storage/File/Filesystem.php on line 69