Thread:Extension talk:Zend Search Lucene for MediaWiki/It works in MediaWiki 1.20.2

It works in MediaWiki 1.20.2, but I get an error message when I run PslZendSearchLuceneIndexer.php on bash:

Warning: chgrp: Unable to find gid for somewiki in /home/content/30/9164430/html/zend/PslZendSearchLuceneIndexer.php on line 296 2012-12-18T16:14:47-07:00 INFO (6): LuceneIndexer Error-Message! ERROR: chgrp command: :/home/content/30/9164430/html/zend/psl_search_indexes/wikidb_sysdoc:somewiki-->wikidb_sysdoc

What is it mean? How can I fix this?