MediaWiki internal error.

Original exception: exception 'MWException' with message 'Unable to determine IP' in /usr/local/www/mediawiki/includes/ProxyTools.php:115
Stack trace:
#0 /usr/local/www/mediawiki/includes/User.php(1531): wfGetIP()
#1 /usr/local/www/mediawiki/includes/db/Database.php(478): User->getName()
#2 /usr/local/www/mediawiki/includes/db/DatabaseMysql.php(119): DatabaseBase->query('SET sql_mode = ...', 'DatabaseMysql::...')
#3 /usr/local/www/mediawiki/includes/db/Database.php(341): DatabaseMysql->open('localhost', 'wikiuser', 'xfwHc9oRSG0T', 'wikidb')
#4 /usr/local/www/mediawiki/includes/db/LoadBalancer.php(647): DatabaseBase->__construct('localhost', 'wikiuser', 'xfwHc9oRSG0T', 'wikidb', 1, 16)
#5 /usr/local/www/mediawiki/includes/db/LoadBalancer.php(530): LoadBalancer->reallyOpenConnection(Array, false)
#6 /usr/local/www/mediawiki/includes/db/LoadBalancer.php(453): LoadBalancer->openConnection(0, false)
#7 /usr/local/www/mediawiki/includes/BagOStuff.php(235): LoadBalancer->getConnection(-2)
#8 /usr/local/www/mediawiki/includes/BagOStuff.php(245): SqlBagOStuff->getDB()
#9 /usr/local/www/mediawiki/includes/MessageCache.php(241): SqlBagOStuff->get('wikidb-mw_:mess...')
#10 /usr/local/www/mediawiki/includes/MessageCache.php(588): MessageCache->load('en')
#11 /usr/local/www/mediawiki/includes/MessageCache.php(527): MessageCache->getMsgFromNamespace('Pagetitle', 'en')
#12 [internal function]: MessageCache->get('pagetitle', true, false)
#13 /usr/local/www/mediawiki/includes/StubObject.php(58): call_user_func_array(Array, Array)
#14 /usr/local/www/mediawiki/includes/StubObject.php(76): StubObject->_call('get', Array)
#15 /usr/local/www/mediawiki/includes/GlobalFunctions.php(742): StubObject->__call('get', Array)
#16 /usr/local/www/mediawiki/includes/GlobalFunctions.php(742): StubObject->get('pagetitle', true, false)
#17 /usr/local/www/mediawiki/includes/GlobalFunctions.php(707): wfMsgGetKey('pagetitle', true, false, true)
#18 /usr/local/www/mediawiki/includes/GlobalFunctions.php(613): wfMsgReal('pagetitle', Array, true)
#19 /usr/local/www/mediawiki/includes/OutputPage.php(480): wfMsg('pagetitle', '2006-Oct-12 Boo...')
#20 /usr/local/www/mediawiki/includes/Article.php(785): OutputPage->setPageTitle('2006-Oct-12 Boo...')
#21 /usr/local/www/mediawiki/includes/Wiki.php(493): Article->view()
#22 /usr/local/www/mediawiki/includes/Wiki.php(70): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#23 /usr/local/www/mediawiki/index.php(117): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#24 {main}

Exception caught inside exception handler: exception 'MWException' with message 'Unable to determine IP' in /usr/local/www/mediawiki/includes/ProxyTools.php:115
Stack trace:
#0 /usr/local/www/mediawiki/includes/User.php(1531): wfGetIP()
#1 /usr/local/www/mediawiki/includes/db/Database.php(478): User->getName()
#2 /usr/local/www/mediawiki/includes/db/DatabaseMysql.php(119): DatabaseBase->query('SET sql_mode = ...', 'DatabaseMysql::...')
#3 /usr/local/www/mediawiki/includes/db/Database.php(341): DatabaseMysql->open('localhost', 'wikiuser', 'xfwHc9oRSG0T', 'wikidb')
#4 /usr/local/www/mediawiki/includes/db/LoadBalancer.php(647): DatabaseBase->__construct('localhost', 'wikiuser', 'xfwHc9oRSG0T', 'wikidb', 1, 16)
#5 /usr/local/www/mediawiki/includes/db/LoadBalancer.php(530): LoadBalancer->reallyOpenConnection(Array, false)
#6 /usr/local/www/mediawiki/includes/db/LoadBalancer.php(453): LoadBalancer->openConnection(0, false)
#7 /usr/local/www/mediawiki/includes/BagOStuff.php(235): LoadBalancer->getConnection(-2)
#8 /usr/local/www/mediawiki/includes/BagOStuff.php(245): SqlBagOStuff->getDB()
#9 /usr/local/www/mediawiki/includes/MessageCache.php(241): SqlBagOStuff->get('wikidb-mw_:mess...')
#10 /usr/local/www/mediawiki/includes/MessageCache.php(588): MessageCache->load('en')
#11 /usr/local/www/mediawiki/includes/MessageCache.php(527): MessageCache->getMsgFromNamespace('Internalerror', 'en')
#12 /usr/local/www/mediawiki/includes/GlobalFunctions.php(742): MessageCache->get('internalerror', true, false)
#13 /usr/local/www/mediawiki/includes/GlobalFunctions.php(707): wfMsgGetKey('internalerror', true, false, true)
#14 /usr/local/www/mediawiki/includes/GlobalFunctions.php(613): wfMsgReal('internalerror', Array, true)
#15 /usr/local/www/mediawiki/includes/Exception.php(119): wfMsg('internalerror')
#16 /usr/local/www/mediawiki/includes/Exception.php(153): MWException->getPageTitle()
#17 /usr/local/www/mediawiki/includes/Exception.php(191): MWException->reportHTML()
#18 /usr/local/www/mediawiki/includes/Exception.php(289): MWException->report()
#19 /usr/local/www/mediawiki/includes/Exception.php(348): wfReportException(Object(MWException))
#20 [internal function]: wfExceptionHandler(Object(MWException))
#21 {main}