Here is the complete error message. I've also tried with other skins than default and same result. I wonder about some issue with the Parser.php or with language data (bad escape sequences for apostrophs may be ?)
[b2f0906e38269c1116736832] /index.php/Accueil MWException: Parser state cleared while parsing. Did you call Parser::parse recursively? Lock is held by: #0 C:\www\mediawiki\includes\parser\Parser.php(882): Parser->lock()
#1 C:\www\mediawiki\includes\parser\Parser.php(4821): Parser->preprocess('Votre page d\xE2\x80\x99...', Object(MediaWiki\Title\Title), Object(ParserOptions))
#2 C:\www\mediawiki\includes\language\MessageCache.php(1442): Parser->transformMsg('Votre page d\xE2\x80\x99...', Object(ParserOptions), Object(MediaWiki\Title\Title))
#3 C:\www\mediawiki\includes\language\Message.php(1464): MessageCache->transform('Votre page d\xE2\x80\x99...', true, Object(Language), Object(MediaWiki\Title\Title))
#4 C:\www\mediawiki\includes\language\Message.php(1011): Message->transformText('Votre page d\xE2\x80\x99...')
#5 C:\www\mediawiki\includes\language\Message.php(1059): Message->format('text')
#6 C:\www\mediawiki\includes\linker\Linker.php(2207): Message->text()
#7 C:\www\mediawiki\includes\linker\Linker.php(2388): MediaWiki\Linker\Linker::titleAttrib('pt-userpage', Array, Array, Object(DerivativeContext))
#8 C:\www\mediawiki\includes\skins\components\SkinComponentLink.php(236): MediaWiki\Linker\Linker::tooltipAndAccesskeyAttribs('pt-userpage', Array, Array)
#9 C:\www\mediawiki\includes\skins\components\SkinComponentLink.php(183): MediaWiki\Skin\SkinComponentLink->applyLinkTitleAttribs(Array, true, Array)
#10 C:\www\mediawiki\includes\skins\components\SkinComponentLink.php(254): MediaWiki\Skin\SkinComponentLink->makeLink('userpage', Array, Array)
#11 C:\www\mediawiki\includes\skins\components\SkinComponentListItem.php(170): MediaWiki\Skin\SkinComponentLink->getTemplateData()
#12 C:\www\mediawiki\includes\skins\components\SkinComponentListItem.php(221): MediaWiki\Skin\SkinComponentListItem->makeListItem('userpage', Array, Array, Array)
#13 C:\www\mediawiki\includes\skins\components\SkinComponentMenu.php(166): MediaWiki\Skin\SkinComponentListItem->getTemplateData()
#14 C:\www\mediawiki\includes\skins\Skin.php(2470): MediaWiki\Skin\SkinComponentMenu->getTemplateData()
#15 C:\www\mediawiki\includes\skins\SkinTemplate.php(641): Skin->getPortletData('user-page', Array)
#16 C:\www\mediawiki\includes\skins\SkinTemplate.php(181): SkinTemplate->getPortletsTemplateData()
#17 C:\www\mediawiki\includes\skins\SkinMustache.php(125): SkinTemplate->getTemplateData()
#18 C:\www\mediawiki\skins\Vector\includes\SkinVector22.php(329): SkinMustache->getTemplateData()
#19 C:\www\mediawiki\includes\skins\SkinMustache.php(92): MediaWiki\Skins\Vector\SkinVector22->getTemplateData()
#20 C:\www\mediawiki\includes\skins\SkinTemplate.php(174): SkinMustache->generateHTML()
#21 C:\www\mediawiki\includes\Output\OutputPage.php(2947): SkinTemplate->outputPage()
#22 C:\www\mediawiki\includes\MediaWiki.php(978): MediaWiki\Output\OutputPage->output(true)
#23 C:\www\mediawiki\includes\MediaWiki.php(613): MediaWiki->main()
#24 C:\www\mediawiki\index.php(50): MediaWiki->run()
#25 C:\www\mediawiki\index.php(46): wfIndexMain()
#26 {main}