MediaWiki internal error.

Original exception: [7ee60b36] /index.php5?title=Special:Watchlist Exception from line 346 of /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/specialpage/SpecialPage.php: Please <a href="/index.php5?title=Special:UserLogin&amp;returnto=Special%3AWatchlist" title="Special:UserLogin">log in</a> to view or edit items on your watchlist.
Backtrace:
#0 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/specials/SpecialWatchlist.php(44): SpecialPage->requireLogin(Message)
#1 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/specialpage/SpecialPage.php(379): SpecialWatchlist->execute(NULL)
#2 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/specialpage/SpecialPageFactory.php(503): SpecialPage->run(NULL)
#3 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Wiki.php(285): SpecialPageFactory::executePath(Title, RequestContext)
#4 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Wiki.php(588): MediaWiki->performRequest()
#5 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Wiki.php(447): MediaWiki->main()
#6 /homepages/44/d159802112/htdocs/rootsunearthed_new/index.php(46): MediaWiki->run()
#7 /homepages/44/d159802112/htdocs/rootsunearthed_new/index.php5(24): require(string)
#8 {main}

Exception caught inside exception handler: [11fb647b] /index.php5?title=Special:Watchlist Exception from line 222 of /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Hooks.php: Detected bug in an extension! Hook Cite::clearState has invalid call signature; Parameter 1 to Cite::clearState() expected to be a reference, value given
Backtrace:
#0 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/GlobalFunctions.php(4013): Hooks::run(string, array, NULL)
#1 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/parser/Parser.php(340): wfRunHooks(string, array)
#2 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/parser/Parser.php(4825): Parser->clearState()
#3 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/parser/Parser.php(614): Parser->startParse(Title, ParserOptions, integer, boolean)
#4 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/parser/Parser.php(4852): Parser->preprocess(string, Title, ParserOptions)
#5 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/cache/MessageCache.php(1008): Parser->transformMsg(string, ParserOptions, Title)
#6 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Message.php(977): MessageCache->transform(string, boolean, Language, Title)
#7 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Message.php(669): Message->transformText(string)
#8 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Message.php(732): Message->toString()
#9 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/OutputPage.php(853): Message->text()
#10 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/OutputPage.php(898): OutputPage->setHTMLTitle(Message)
#11 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/OutputPage.php(2156): OutputPage->setPageTitle(string)
#12 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/OutputPage.php(2185): OutputPage->prepareErrorPage(Message)
#13 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/exception/ErrorPageError.php(58): OutputPage->showErrorPage(Message, Message, array)
#14 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/exception/MWExceptionHandler.php(44): ErrorPageError->report()
#15 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/exception/MWExceptionHandler.php(139): MWExceptionHandler::report(UserNotLoggedIn)
#16 /homepages/44/d159802112/htdocs/rootsunearthed_new/includes/Wiki.php(454): MWExceptionHandler::handle(UserNotLoggedIn)
#17 /homepages/44/d159802112/htdocs/rootsunearthed_new/index.php(46): MediaWiki->run()
#18 /homepages/44/d159802112/htdocs/rootsunearthed_new/index.php5(24): require(string)
#19 {main}