Error: Class "complextypes_KontaktItem__skin_footer_html_KontaktItem_ViewObject_en" not found

Details:

#0 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_frontend/components/simple/SimpleContainerRenderer/SimpleContainerRenderer.class.php(195): GenericSkinClassFactory->getSkinClass()
#1 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_frontend/components/simple/SimpleContainerRenderer/SimpleContainerRenderer.class.php(418): SimpleContainerRenderer->renderObject()
#2 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_cache/skins/base/skin.htmlBase_Page_en.class.php(85): SimpleContainerRenderer->render()
#3 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_frontend/components/core/Page/Page.class.php(31): base__skin_html_Base_Page_en->render()
#4 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_frontend/Controller.class.php(1943): Page->render()
#5 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_shop/GBShopController.class.php(101): Controller->render()
#6 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/produkte/index.php(16): GBShopController->render()
#7 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/_frontend/Virtualizer.class.php(151): include('...')
#8 /var/www/vhosts/test.sunlumo-energy.com/httpdocs/virtualizer.php(47): Virtualizer->loadSite()
#9 {main}