Error in Article Anywhere 16.0.9 Pro

I am getting an error on my Joomla 5.1.4 website with the version of AA mentioned in the subject line.
The error log is below.
I have changed the domain name to www.xxxx.yy

I am not sure if this is caused by our template or by the component.

I hope you have enough info to find and fix it.

Robert
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A PHP Exception occurred on your site. Here you can find the stack trace:

Exception Type: Error
File: /home/wusr90325/www/templates/flex/html/com_content/article/default.php
Line: 76
Message: Call to undefined method Joomla\CMS\Document\FeedDocument::addCustomTag()

#0 /home/wusr90325/www/libraries/src/MVC/View/HtmlView.php(416): include()
#1 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataGroups/Helpers/ArticleView.php(258): Joomla\CMS\MVC\View\HtmlView->loadTemplate()
#2 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataGroups/Helpers/ArticleLayout.php(43): RegularLabs\Plugin\System\ArticlesAnywhere\DataGroups\Helpers\ArticleView->display()
#3 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataGroups/Article.php(867): RegularLabs\Plugin\System\ArticlesAnywhere\DataGroups\Helpers\ArticleLayout::render()
#4 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataGroups/Article.php(220): RegularLabs\Plugin\System\ArticlesAnywhere\DataGroups\Article->getArticleLayout()
#5 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataGroups/DataGroup.php(280): RegularLabs\Plugin\System\ArticlesAnywhere\DataGroups\Article->getValue()
#6 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataTags/DataTag.php(92): RegularLabs\Plugin\System\ArticlesAnywhere\DataGroups\DataGroup->getOutput()
#7 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataTags/DataTag.php(104): RegularLabs\Plugin\System\ArticlesAnywhere\DataTags\DataTag->getOutput()
#8 /home/wusr90325/www/plugins/system/articlesanywhere/src/DataTags/DataTags.php(98): RegularLabs\Plugin\System\ArticlesAnywhere\DataTags\DataTag->replace()
#9 /home/wusr90325/www/plugins/system/articlesanywhere/src/Article.php(71): RegularLabs\Plugin\System\ArticlesAnywhere\DataTags\DataTags->replace()
#10 /home/wusr90325/www/plugins/system/articlesanywhere/src/Articles.php(226): RegularLabs\Plugin\System\ArticlesAnywhere\Article->render()
#11 /home/wusr90325/www/plugins/system/articlesanywhere/src/PluginTag.php(76): RegularLabs\Plugin\System\ArticlesAnywhere\Articles->render()
#12 /home/wusr90325/www/plugins/system/articlesanywhere/src/Replace.php(226): RegularLabs\Plugin\System\ArticlesAnywhere\PluginTag->render()
#13 /home/wusr90325/www/plugins/system/articlesanywhere/src/Replace.php(213): RegularLabs\Plugin\System\ArticlesAnywhere\Replace::replaceTagsInString()
#14 /home/wusr90325/www/plugins/system/articlesanywhere/src/Replace.php(98): RegularLabs\Plugin\System\ArticlesAnywhere\Replace::process()
#15 /home/wusr90325/www/plugins/system/articlesanywhere/articlesanywhere.php(163): RegularLabs\Plugin\System\ArticlesAnywhere\Replace::render()
#16 /home/wusr90325/www/libraries/regularlabs/src/SystemPlugin.php(139): PlgSystemArticlesAnywhere->changeFinalHtmlOutput()
#17 /home/wusr90325/www/libraries/src/Plugin/CMSPlugin.php(289): RegularLabs\Library\SystemPlugin->onAfterRender()
#18 /home/wusr90325/www/libraries/vendor/joomla/event/src/Dispatcher.php(454): Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}()
#19 /home/wusr90325/www/libraries/vendor/joomla/application/src/AbstractApplication.php(99): Joomla\Event\Dispatcher->dispatch()
#20 /home/wusr90325/www/libraries/src/Application/CMSApplication.php(1079): Joomla\Application\AbstractApplication->dispatchEvent()
#21 /home/wusr90325/www/libraries/src/Application/SiteApplication.php(732): Joomla\CMS\Application\CMSApplication->render()
#22 /home/wusr90325/www/libraries/src/Application/CMSApplication.php(311): Joomla\CMS\Application\SiteApplication->render()
#23 /home/wusr90325/www/includes/app.php(58): Joomla\CMS\Application\CMSApplication->execute()
#24 /home/wusr90325/www/index.php(32): require_once('...')
#25 {main}

Request information
GET variables

Array
(
[format] => feed
[type] => rss
)

POST variables

Array
(
)

COOKIE variables

Array
(
)

REQUEST variables

Array
(
[format] => feed
[type] => rss
)

SERVER variables

Array
(
[REDIRECT_HTTP_AUTHORIZATION] =>
[REDIRECT_HTTPS] => on
[REDIRECT_SSL_TLS_SNI] => www.xxxx.yy
[REDIRECT_STATUS] => 200
[HTTP_AUTHORIZATION] =>
[HTTPS] => on
[SSL_TLS_SNI] => www.xxxx.yy
[HTTP_HOST] => www.xxxx.yy
[HTTP_AMP_CACHE_TRANSFORM] => google;v="1..8"
[HTTP_CONNECTION] => keep-alive
[HTTP_ACCEPT] => text/html,application/xhtml+xml,application/signed-exchange;v=b3,application/xml;q=0.9,*/*;q=0.8
[HTTP_FROM] => googlebot(at)googlebot.com
[HTTP_USER_AGENT] => Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.6613.113 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
[HTTP_ACCEPT_ENCODING] => gzip, deflate, br
[PATH] => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
[SERVER_SIGNATURE] => <address>Apache/2.4.59 (Debian) Server at www.xxxx.yy Port 443</address>

[SERVER_SOFTWARE] => Apache/2.4.59 (Debian)
[SERVER_NAME] => www.xxxx.yy
[SERVER_ADDR] => 1.2.3.4
[SERVER_PORT] => 443
[REMOTE_ADDR] => 66.249.75.38
[DOCUMENT_ROOT] => /home/wusr90325/www
[REQUEST_SCHEME] => https
[CONTEXT_PREFIX] =>
[CONTEXT_DOCUMENT_ROOT] => /home/wusr90325/www
[SERVER_ADMIN] => [no address given]
[SCRIPT_FILENAME] => /home/wusr90325/www/index.php
[REMOTE_PORT] => 49073
[REDIRECT_URL] => /links/examples
[REDIRECT_QUERY_STRING] => format=feed&type=rss
[GATEWAY_INTERFACE] => CGI/1.1
[SERVER_PROTOCOL] => HTTP/1.1
[REQUEST_METHOD] => GET
[QUERY_STRING] => format=feed&type=rss
[REQUEST_URI] => /links/examples?format=feed&type=rss
[SCRIPT_NAME] => /index.php
[PHP_SELF] => /index.php
[REQUEST_TIME_FLOAT] => 1726031398.6898
[REQUEST_TIME] => 1726031398
)
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