MediaWiki internal error.

Original exception: [62153883] /index.php/Special:UserLogin/signup Exception from line 1177 of /var/www/wiki/public_html/includes/specials/SpecialUserlogin.php:
Backtrace:
#0 /var/www/wiki/public_html/includes/specials/SpecialUserlogin.php(232): LoginForm->mainLoginForm(string)
#1 /var/www/wiki/public_html/includes/specialpage/SpecialPage.php(379): LoginForm->execute(string)
#2 /var/www/wiki/public_html/includes/specialpage/SpecialPageFactory.php(503): SpecialPage->run(string)
#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: [33f9bf9c] /index.php/Special:UserLogin/signup 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/OutputPage.php(1551): Parser->parse(string, Title, ParserOptions, boolean, boolean, NULL)
#3 /var/www/wiki/public_html/includes/OutputPage.php(1494): OutputPage->addWikiTextTitle(string, Title, boolean, boolean, boolean)
#4 /var/www/wiki/public_html/includes/OutputPage.php(2250): OutputPage->addWikiText(string)
#5 /var/www/wiki/public_html/includes/exception/PermissionsError.php(55): OutputPage->showPermissionsErrorPage(array, string)
#6 /var/www/wiki/public_html/includes/exception/MWExceptionHandler.php(44): PermissionsError->report()
#7 /var/www/wiki/public_html/includes/exception/MWExceptionHandler.php(139): MWExceptionHandler::report(PermissionsError)
#8 /var/www/wiki/public_html/includes/Wiki.php(454): MWExceptionHandler::handle(PermissionsError)
#9 /var/www/wiki/public_html/index.php(46): MediaWiki->run()
#10 {main}