Using of the Mailchimp CE results in Fatal Error

[Etheliene]

Whenever I want to place the mailchimp content element I encounter the following issue on all "parent pages" and the page itself:
Fatal error: Uncaught TYPO3Fluid\Fluid\Core\ViewHelper\Exception: No Content Object definition found at TypoScript object path "tt_content.list.20." in /var/www/vhosts/ebds.online/httpdocs/public/typo3/sysext/fluid/Classes/ViewHelpers/CObjectViewHelper.php:161 Stack trace: #0 /var/www/vhosts/ebds.online/httpdocs/var/cache/code/fluid_template/Standard_action_List_e902fe832de5110b926f837b757b3c0e671b738c.php(76): TYPO3\CMS\Fluid\ViewHelpers\CObjectViewHelper::renderStatic(Array, Object(Closure), Object(TYPO3\CMS\Fluid\Core\Rendering\RenderingContext)) #1 /var/www/vhosts/ebds.online/httpdocs/vendor/typo3fluid/fluid/src/View/AbstractTemplateView.php(260): Standard_action_List_e902fe832de5110b926f837b757b3c0e671b738c->section_62bce9422ff2d14f69ab80a154510232fc8a9afd(Object(TYPO3\CMS\Fluid\Core\Rendering\RenderingContext)) #2 /var/www/vhosts/ebds.online/httpdocs/vendor/typo3fluid/fluid/src/ViewHelpers/RenderViewHelper.php(143): TYPO3Fluid\Fluid\View\AbstractTemplateView->renderSection('Main', Array, true) #3 /var/www/vhosts/ebd in /var/www/vhosts/ebds.online/httpdocs/public/typo3/sysext/fluid/Classes/ViewHelpers/CObjectViewHelper.php on line 161

I have no clue what the problem might be.