Fehlermeldung "The provided X-CSRF-Token for path..." und kein Mailversand seit Tagen

Hallo, 

es werden seit zwei Tagen keine Mails mehr versendet. Alles was ich finde, sind diese Fehlermeldungen, die ich leider nicht verstehe. Kann jemand weiterhelfen?

***Cirtical

The provided X-CSRF-Token for path „/checkout/deleteArticle/sDelete/499102/sTargetAction/cart“ is invalid. Please go back, reload the page and try again.

*** Error

Shopware\Components\CSRFTokenValidationException: The provided X-CSRF-Token for path „/checkout/deleteArticle/sDelete/499102/sTargetAction/cart“ is invalid. Please go back, reload the page and try again. in /engine/Shopware/Components/CSRFTokenValidator.php:144 Stack trace:
#0 /engine/Library/Enlight/Event/Handler/Default.php(91): Shopware\Components\CSRFTokenValidator->checkFrontendTokenValidation(Object(Enlight_Controller_ActionEventArgs))
#1 /engine/Library/Enlight/Event/EventManager.php(219): Enlight_Event_Handler_Default->execute(Object(Enlight_Controller_ActionEventArgs))
#2 /engine/Library/Enlight/Controller/Action.php(175): Enlight_Event_EventManager->notify(‚Enlight_Control…‘, Object(Enlight_Controller_ActionEventArgs))
#3 /engine/Library/Enlight/Controller/Dispatcher/Default.php(563): Enlight_Controller_Action->dispatch(‚deleteArticleAc…‘)
#4 /engine/Library/Enlight/Controller/Front.php(222): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp))
#5 /engine/Shopware/Kernel.php(202): Enlight_Controller_Front->dispatch()
#6 /vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(102): Shopware\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#7 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(448): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(Shopware\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true)
#8 /engine/Shopware/Components/HttpCache/AppCache.php(260): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL)
#9 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(420): Shopware\Components\HttpCache\AppCache->forward(Object(Symfony\Component\HttpFoundation\Request), true)
#10 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(317): Symfony\Component\HttpKernel\HttpCache\HttpCache->fetch(Object(Symfony\Component\HttpFoundation\Request), true)
#11 /engine/Shopware/Components/HttpCache/AppCache.php(187): Symfony\Component\HttpKernel\HttpCache\HttpCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#12 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(192): Shopware\Components\HttpCache\AppCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#13 /engine/Shopware/Components/HttpCache/AppCache.php(116): Symfony\Component\HttpKernel\HttpCache\HttpCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#14 /var/www/clients/client783/web9204/web/shopware.php(122): Shopware\Components\HttpCache\AppCache->handle(Object(Symfony\Component\HttpFoundation\Request))
#15

Shopware 5.5.8

Gruß Lisa