MediaWiki internal error.

Original exception: [d9dc5571] /index.php/Special:Preferences Exception from line 346 of /var/www/wiki/public_html/includes/specialpage/SpecialPage.php: Please <a href="/index.php?title=Special:UserLogin&amp;returnto=Special%3APreferences" title="Special:UserLogin">log in</a> to change your preferences.
Backtrace:
#0 /var/www/wiki/public_html/includes/specials/SpecialPreferences.php(40): SpecialPage->requireLogin(Message)
#1 /var/www/wiki/public_html/includes/specialpage/SpecialPage.php(379): SpecialPreferences->execute(NULL)
#2 /var/www/wiki/public_html/includes/specialpage/SpecialPageFactory.php(503): SpecialPage->run(NULL)
#3 /var/www/wiki/public_html/includes/Wiki.php(285): SpecialPageFactory::executePath(Title, RequestContext)
#4 /var/www/wiki/public_html/includes/Wiki.php(588): MediaWiki->performRequest()
#5 /var/www/wiki/public_html/includes/Wiki.php(447): MediaWiki->main()
#6 /var/www/wiki/public_html/index.php(46): MediaWiki->run()
#7 {main}

Exception caught inside exception handler: [41e57403] /index.php/Special:Preferences Exception from line 222 of /var/www/wiki/public_html/includes/Hooks.php: Detected bug in an extension! Hook efGoogleAnalyticsASAC has invalid call signature; Parameter 1 to efGoogleAnalyticsASAC() expected to be a reference, value given
Backtrace:
#0 /var/www/wiki/public_html/includes/GlobalFunctions.php(4013): Hooks::run(string, array, NULL)
#1 /var/www/wiki/public_html/includes/parser/Parser.php(500): wfRunHooks(string, array)
#2 /var/www/wiki/public_html/includes/cache/MessageCache.php(1070): Parser->parse(string, Title, ParserOptions, boolean)
#3 /var/www/wiki/public_html/includes/Message.php(963): MessageCache->parse(string, Title, boolean, boolean, Language)
#4 /var/www/wiki/public_html/includes/Message.php(667): Message->parseText(string)
#5 /var/www/wiki/public_html/includes/Message.php(756): Message->toString()
#6 /var/www/wiki/public_html/includes/OutputPage.php(2174): Message->parseAsBlock()
#7 /var/www/wiki/public_html/includes/exception/ErrorPageError.php(58): OutputPage->showErrorPage(Message, Message, array)
#8 /var/www/wiki/public_html/includes/exception/MWExceptionHandler.php(44): ErrorPageError->report()
#9 /var/www/wiki/public_html/includes/exception/MWExceptionHandler.php(139): MWExceptionHandler::report(UserNotLoggedIn)
#10 /var/www/wiki/public_html/includes/Wiki.php(454): MWExceptionHandler::handle(UserNotLoggedIn)
#11 /var/www/wiki/public_html/index.php(46): MediaWiki->run()
#12 {main}