Code:
Symfony\Component\Routing\Exception\InvalidParameterException:
Parameter "alias" for route "contao_frontend" must match ".+" ("" given) to generate a corresponding URL.
at vendor/symfony/routing/Generator/UrlGenerator.php:193
at Symfony\Component\Routing\Generator\UrlGenerator->doGenerate(array('alias' => 0), array('_token_check' => true, '_controller' => 'Contao\\CoreBundle\\Controller\\FrontendController::indexAction', '_scope' => 'frontend'), array('alias' => '.+'), array(array('text', '.html'), array('variable', '/', '.+', 'alias')), array('alias' => ''), 'contao_frontend', 1, array())
(vendor/symfony-cmf/routing/src/ProviderBasedGenerator.php:78)
at Symfony\Cmf\Component\Routing\ProviderBasedGenerator->generate('contao_frontend', array('alias' => ''), 1)
(vendor/symfony-cmf/routing/src/DynamicRouter.php:180)
at Symfony\Cmf\Component\Routing\DynamicRouter->generate('contao_frontend', array('alias' => ''), 1)
(vendor/symfony-cmf/routing/src/ChainRouter.php:248)
at Symfony\Cmf\Component\Routing\ChainRouter->generate('contao_frontend', array('alias' => ''), 1)
(vendor/contao/core-bundle/src/Routing/UrlGenerator.php:81)
at Contao\CoreBundle\Routing\UrlGenerator->generate('', array('alias' => ''))
(vendor/contao/core-bundle/src/Resources/contao/library/Contao/Controller.php:1314)
at Contao\Controller::generateFrontendUrl(array('rootId' => null, 'domain' => null, 'rootLanguage' => null, 'rootUseSSL' => null), null, null, true)
(vendor/contao/core-bundle/src/Framework/Adapter.php:44)
at Contao\CoreBundle\Framework\Adapter->__call('generateFrontendUrl', array(array(), null, null, true))
(vendor/contao-community-alliance/events-contao-bindings/src/Subscribers/ControllerSubscriber.php:172)
at ContaoCommunityAlliance\Contao\Bindings\Subscribers\ControllerSubscriber->handleGenerateFrontendUrl(object(GenerateFrontendUrlEvent), 'contao.events.controller.generate-frontend-url', object(TraceableEventDispatcher))
(vendor/symfony/event-dispatcher/Debug/WrappedListener.php:126)
at Symfony\Component\EventDispatcher\Debug\WrappedListener->__invoke(object(GenerateFrontendUrlEvent), 'contao.events.controller.generate-frontend-url', object(TraceableEventDispatcher))
(vendor/symfony/event-dispatcher/EventDispatcher.php:264)
at Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(array(object(WrappedListener)), 'contao.events.controller.generate-frontend-url', object(GenerateFrontendUrlEvent))
(vendor/symfony/event-dispatcher/EventDispatcher.php:239)
at Symfony\Component\EventDispatcher\EventDispatcher->callListeners(array(object(WrappedListener)), 'contao.events.controller.generate-frontend-url', object(GenerateFrontendUrlEvent))
(vendor/symfony/event-dispatcher/EventDispatcher.php:73)
at Symfony\Component\EventDispatcher\EventDispatcher->dispatch(object(GenerateFrontendUrlEvent), 'contao.events.controller.generate-frontend-url')
(vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php:168)
at Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher->dispatch(object(GenerateFrontendUrlEvent), 'contao.events.controller.generate-frontend-url')
(vendor/metamodels/core/src/CoreBundle/EventListener/GetSearchablePagesListener.php:384)
at MetaModels\CoreBundle\EventListener\GetSearchablePagesListener->getBaseUrl(array())
(vendor/metamodels/core/src/CoreBundle/EventListener/GetSearchablePagesListener.php:419)
at MetaModels\CoreBundle\EventListener\GetSearchablePagesListener->removeEmptyDetailPages(array(array('langcode' => 'xx', 'value' => '', 'filter' => '2')))
(vendor/metamodels/core/src/CoreBundle/EventListener/GetSearchablePagesListener.php:566)
at MetaModels\CoreBundle\EventListener\GetSearchablePagesListener->getMetaModelsPages(array('id' => '2', 'pid' => '3', 'tstamp' => '1665499849', 'name' => 'Standorte', 'filter' => '0', 'filterparams' => null, 'rendersetting' => '1', 'published' => '1'), '1', 'de')
(vendor/metamodels/core/src/CoreBundle/EventListener/GetSearchablePagesListener.php:153)
at MetaModels\CoreBundle\EventListener\GetSearchablePagesListener->__invoke(array('https://dialogus-exibition.de/startseite.html', 'https://dialogus-exibition.de/passwort-vergessen.html', 'https://dialogus-exibition.de/registrierung.html'), '1', true, 'de')
(vendor/contao/core-bundle/src/Resources/contao/library/Contao/Automator.php:370)
at Contao\Automator->generateSitemap('1')
(vendor/contao/core-bundle/src/Resources/contao/dca/tl_page.php:1089)
at tl_page->generateSitemap(object(DC_Table))
(vendor/contao/core-bundle/src/Resources/contao/drivers/DC_Table.php:197)
at Contao\DC_Table->__construct('tl_page', array('tables' => array('tl_page')))
(vendor/contao/core-bundle/src/Resources/contao/classes/Backend.php:409)
at Contao\Backend->getBackendModule('page', null)
(vendor/contao/core-bundle/src/Resources/contao/controllers/BackendMain.php:169)
at Contao\BackendMain->run()
(vendor/contao/core-bundle/src/Controller/BackendController.php:48)
at Contao\CoreBundle\Controller\BackendController->mainAction()
(vendor/symfony/http-kernel/HttpKernel.php:169)
at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
(vendor/symfony/http-kernel/HttpKernel.php:81)
at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
(vendor/symfony/http-kernel/Kernel.php:201)
at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
(web/index.php:31)
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