Thread:Project:Support desk/MediaWiki:Vector.css, Broken!

hello, when I try to change the theme css Vector in "MediaWiki:Vector.css" appears the following error message:

Could not acquire 'wssouza01-wiki_:messages:en:status' lock. Backtrace:
 * 1) 0 /home/wteachers/www/wiki/includes/cache/MessageCache.php(710): MessageCache->load('en')
 * 2) 1 /home/wteachers/www/wiki/includes/cache/MessageCache.php(650): MessageCache->getMsgFromNamespace('January/en', 'en')
 * 3) 2 /home/wteachers/www/wiki/includes/Message.php(720): MessageCache->get('january', true, Object(Language))
 * 4) 3 /home/wteachers/www/wiki/includes/Message.php(464): Message->fetchMessage
 * 5) 4 /home/wteachers/www/wiki/includes/Message.php(553): Message->toString
 * 6) 5 /home/wteachers/www/wiki/languages/Language.php(923): Message->text
 * 7) 6 /home/wteachers/www/wiki/languages/Language.php(942): Language->getMessageFromDB('january')
 * 8) 7 /home/wteachers/www/wiki/languages/Language.php(951): Language->getMonthName(1)
 * 9) 8 /home/wteachers/www/wiki/includes/OutputPage.php(3025): Language->getMonthNamesArray
 * 10) 9 /home/wteachers/www/wiki/includes/OutputPage.php(2770): OutputPage->getJSVars
 * 11) 10 /home/wteachers/www/wiki/includes/OutputPage.php(2475): OutputPage->getHeadScripts
 * 12) 11 /home/wteachers/www/wiki/includes/SkinTemplate.php(462): OutputPage->headElement(Object(SkinVector))
 * 13) 12 /home/wteachers/www/wiki/includes/OutputPage.php(2034): SkinTemplate->outputPage
 * 14) 13 /home/wteachers/www/wiki/includes/Wiki.php(572): OutputPage->output
 * 15) 14 /home/wteachers/www/wiki/includes/Wiki.php(458): MediaWiki->main
 * 16) 15 /home/wteachers/www/wiki/index.php(59): MediaWiki->run
 * 17) 16 {main}

how can I fix this error?