Wikimedia Bugzilla is closed!

This happens while I'm viewing the revisions of an article, no matter by viewing the diff or checking those deleted revisions.

The article text cannot be shown, instead, a traceback:

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{{MediaWiki:Tagline}}

MagicWordArray::parseMatch: parameter not found

Backtrace:

#0 /usr/local/apache/common-local/wmf-deployment/includes/MagicWord.php(674): MagicWordArray->parseMatch(Array)
#1 /usr/local/apache/common-local/wmf-deployment/includes/parser/Parser.php(3394): MagicWordArray->matchAndRemove(NULL)
#2 /usr/local/apache/common-local/wmf-deployment/includes/parser/Parser.php(909): Parser->doDoubleUnderscore('<div class="mw-...')
#3 /usr/local/apache/common-local/wmf-deployment/includes/parser/Parser.php(328): Parser->internalParse('<div class="mw-...')
#4 [internal function]: Parser->parse('<div class="mw-...', Object(Title), Object(ParserOptions), true, true, NULL)
#5 /usr/local/apache/common-local/wmf-deployment/includes/StubObject.php(58): call_user_func_array(Array, Array)
#6 /usr/local/apache/common-local/wmf-deployment/includes/StubObject.php(76): StubObject->_call('parse', Array)
#7 [internal function]: StubObject->__call('parse', Array)
#8 /usr/local/apache/common-local/wmf-deployment/includes/OutputPage.php(905): StubObject->parse('<div class="mw-...', Object(Title), Object(ParserOptions), true, true, NULL)
#9 /usr/local/apache/common-local/wmf-deployment/includes/OutputPage.php(2197): OutputPage->parse('<div class="mw-...', true, true)
#10 /usr/local/apache/common-local/wmf-deployment/includes/EditPage.php(726): OutputPage->wrapWikiMsg('<div class="mw-...', 'newarticletext')
#11 /usr/local/apache/common-local/wmf-deployment/includes/EditPage.php(438): EditPage->showIntro()
#12 /usr/local/apache/common-local/wmf-deployment/includes/EditPage.php(351): EditPage->edit()
#13 /usr/local/apache/common-local/wmf-deployment/includes/Wiki.php(541): EditPage->submit()
#14 /usr/local/apache/common-local/wmf-deployment/includes/Wiki.php(70): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#15 /usr/local/apache/common-local/wmf-deployment/index.php(117): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#16 /usr/local/apache/common-local/live-1.5/index.php(3): require('/usr/local/apac...')
#17 {main}
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And at the same time, the <title> changed from normal to <title> - {{#switch:{{int:Conversionname}}|zh|zh-hans|zh-cn|zh-sg=维基百科，自由的百科全书|zh-hant|zh-tw|zh-hk=維基百科，自由的百科全書}}</title>

After some refresh, the error screen would disappear, but about 10m later, it appears again. Guess there's something wrong with the parser function.

The pages I attempted to view:
* http://zh.wikipedia.org/w/index.php?diff=11856199
* http://zh.wikipedia.org/w/index.php?title=%E7%B6%AD%E5%9F%BA%E4%BA%BA&action=edit&redlink=1