adunto el texto que aparece y captura de pantlla:

..................................Class "Joomla\CMS\Filesystem\Folder" not found Go Home Call Stack#FunctionLocation1()JROOT/modules/mod_uk_dgallery/mod_uk_dgallery.php:622include()JROOT/libraries/src/Dispatcher/ModuleDispatcher.php:523Joomla\CMS\Dispatcher\ModuleDispatcher::Joomla\CMS\Dispatcher\{closure}()JROOT/libraries/src/Dispatcher/ModuleDispatcher.php:554Joomla\CMS\Dispatcher\ModuleDispatcher->dispatch()JROOT/libraries/src/Helper/ModuleHelper.php:2895Joomla\CMS\Helper\ModuleHelper::renderRawModule()JROOT/libraries/src/Helper/ModuleHelper.php:1606Joomla\CMS\Helper\ModuleHelper::renderModule()JROOT/libraries/src/Document/Renderer/Html/ModuleRenderer.php:997Joomla\CMS\Document\Renderer\Html\ModuleRenderer->render()JROOT/libraries/src/Document/Renderer/Html/ModulesRenderer.php:518Joomla\CMS\Document\Renderer\Html\ModulesRenderer->render()JROOT/libraries/src/Document/HtmlDocument.php:5789Joomla\CMS\Document\HtmlDocument->getBuffer()JROOT/libraries/src/Document/HtmlDocument.php:89710Joomla\CMS\Document\HtmlDocument->_renderTemplate()JROOT/libraries/src/Document/HtmlDocument.php:65011Joomla\CMS\Document\HtmlDocument->render()JROOT/libraries/src/Application/CMSApplication.php:113212Joomla\CMS\Application\CMSApplication->render()JROOT/libraries/src/Application/SiteApplication.php:73913Joomla\CMS\Application\SiteApplication->render()JROOT/libraries/src/Application/CMSApplication.php:32514Joomla\CMS\Application\CMSApplication->execute()JROOT/includes/app.php:5815require_once()JROOT/index.php:51

Did you aktivate the behaviour backward compatibility 6-Plugin?

  I just activated the plugin and it's working now, thank you so much for your help, everything is working correctly now, you're very kind.

It should also work when the compatibility plugin is deactivated. We haven't had any problems with this in any of our installations, so it seems to be only happening to you. However, you should find the root cause of the error permanently, because the plugin will eventually be removed in a future Joomla version, and you'll inevitably encounter the problem again then.

I saw that you just released an update for that module today, January 30th, and I updated it and it works correctly without the compatibility plugin. Thank you so much for your help and speed; everything is working perfectly.