MediaWiki internal error.

Original exception: [454aaa18] /wiki/index.php?title=Help_talk:Contributing_to_this_Wiki/ja&action=edit&redlink=1 Exception from line 222 of /var/www/main/wiki/includes/Hooks.php: Detected bug in an extension! Hook wfSetupImageMap has invalid call signature; Parameter 1 to wfSetupImageMap() expected to be a reference, value given
Backtrace:
#0 /var/www/main/wiki/includes/GlobalFunctions.php(4013): Hooks::run(string, array, NULL)
#1 /var/www/main/wiki/includes/parser/Parser.php(275): wfRunHooks(string, array)
#2 /var/www/main/wiki/includes/cache/MessageCache.php(1023): Parser->firstCallInit()
#3 /var/www/main/wiki/includes/cache/MessageCache.php(1000): MessageCache->getParser()
#4 /var/www/main/wiki/includes/Message.php(977): MessageCache->transform(string, boolean, Language, NULL)
#5 /var/www/main/wiki/includes/Message.php(669): Message->transformText(string)
#6 /var/www/main/wiki/includes/Message.php(732): Message->toString()
#7 /var/www/main/wiki/includes/User.php(4271): Message->text()
#8 /var/www/main/wiki/includes/User.php(4311): User::getGroupPage(string)
#9 [internal function]: User::makeGroupLinkWiki(string)
#10 /var/www/main/wiki/includes/Title.php(2385): array_map(array, array)
#11 /var/www/main/wiki/includes/Title.php(1988): Title->missingPermissionError(string, boolean)
#12 /var/www/main/wiki/includes/Title.php(2436): Title->checkQuickPermissions(string, User, array, boolean, boolean)
#13 /var/www/main/wiki/includes/Title.php(1918): Title->getUserPermissionsErrorsInternal(string, User, boolean)
#14 /var/www/main/wiki/includes/EditPage.php(462): Title->getUserPermissionsErrors(string, User)
#15 /var/www/main/wiki/includes/EditPage.php(395): EditPage->getEditPermissionErrors()
#16 /var/www/main/wiki/includes/actions/EditAction.php(50): EditPage->edit()
#17 /var/www/main/wiki/includes/Wiki.php(428): EditAction->show()
#18 /var/www/main/wiki/includes/Wiki.php(292): MediaWiki->performAction(Article, Title)
#19 /var/www/main/wiki/includes/Wiki.php(588): MediaWiki->performRequest()
#20 /var/www/main/wiki/includes/Wiki.php(447): MediaWiki->main()
#21 /var/www/main/wiki/index.php(46): MediaWiki->run()
#22 {main}

Exception caught inside exception handler: [789c0816] /wiki/index.php?title=Help_talk:Contributing_to_this_Wiki/ja&action=edit&redlink=1 Exception from line 222 of /var/www/main/wiki/includes/Hooks.php: Detected bug in an extension! Hook ExtToggleDisplay::onBeforePageDisplay has invalid call signature; Parameter 1 to ExtToggleDisplay::onBeforePageDisplay() expected to be a reference, value given
Backtrace:
#0 /var/www/main/wiki/includes/GlobalFunctions.php(4013): Hooks::run(string, array, NULL)
#1 /var/www/main/wiki/includes/OutputPage.php(2092): wfRunHooks(string, array)
#2 /var/www/main/wiki/includes/exception/MWException.php(219): OutputPage->output()
#3 /var/www/main/wiki/includes/exception/MWException.php(260): MWException->reportHTML()
#4 /var/www/main/wiki/includes/exception/MWExceptionHandler.php(44): MWException->report()
#5 /var/www/main/wiki/includes/exception/MWExceptionHandler.php(139): MWExceptionHandler::report(MWException)
#6 /var/www/main/wiki/includes/Wiki.php(454): MWExceptionHandler::handle(MWException)
#7 /var/www/main/wiki/index.php(46): MediaWiki->run()
#8 {main}