Snippets im Backend werden nicht geladen

Hallo,

ich hab zurzeit das Problem das ich nach dem Einloggen (Usernamen/Passwort) nicht in mein Backend komme (Shopware 5.1.1) der genaue Fehler lautet:

<h2><span class="frontend_error_exception">Ups! Ein Fehler ist aufgetreten!</span></h2>
<p>
<span class="frontend_error_exception">Die nachfolgenden Hinweise sollten Ihnen weiterhelfen.</span>
</p>
<h3>Unable to load template snippet 'string:{include file="backend/index/model/widget.js"}
{include file="backend/index/model/widget_settings.js"}
{include file="backend/index/model/turnover.js"}
{include file="backend/index/model/batch.js"}
{include file="backend/index/model/customers.js"}
{include file="backend/index/model/visitors.js"}
{include file="backend/index/model/orders.js"}
{include file="backend/index/model/news.js"}
{include file="backend/index/model/merchant.js"}
{include file="backend/index/model/merchant_mail.js"}
{include file="backend/index/model/theme_cache_warm_up.js"}
{include file="backend/index/view/main.js"}
{include file="backend/index/view/menu.js"}
{include file="backend/index/view/footer.js"}
{include file="backend/index/view/search.js"}
{include file="backend/index/view/widgets/window.js"}
{include file="backend/index/view/widgets/sales.js"}
{include file="backend/index/view/widgets/upload.js"}
{include file="backend/index/view/widgets/visitors.js"}
{include file="backend/index/view/widgets/orders.js"}
{include file="backend/index/view/widgets/notice.js"}
{include file="backend/index/view/widgets/merchant.js"}
{include file="backend/index/view/widgets/news.js"}
{include file="backend/index/view/widgets/base.js"}
{include file="backend/index/view/merchant/window.js"}
{include file="backend/index/view/theme_cache/theme_cache_warm_up.js"}
{include file="backend/index/store/widget.js"}
{include file="backend/index/store/widget_settings.js"}
{include file="backend/index/store/theme_cache_warm_up.js"}
{include file="backend/index/controller/main.js"}
{include file="backend/index/controller/widgets.js"}
{include file="backend/index/controller/error_reporter.js"}
{include file="backend/index/controller/theme_cache_warm_up.js"}|backend/trusted_shops_badge/menu_entry.tpl|backend/swag_digital_publishing/icons.tpl|backend/swag_fuzzy/menu_entry.tpl|backend/index/license.tpl|backend/index/ogonecw/index.tpl|backend/index/view/swag_update_menu.js|backend/swag_import_export/menu_entry.tpl|backend/neti_foundation/view/form/support.js|backend/neti_foundation/view/tab/support.js|backend/neti_foundation/view/form/category/list.js|backend/neti_foundation/view/form/category/window.js|backend/neti_foundation/view/form/category/tree.js|backend/neti_foundation/view/form/media/field.js|backend/neti_foundation/view/form/media/list.js|backend/neti_foundation/view/form/media/upload.js|backend/neti_foundation/view/form/media/model.js|backend/neti_foundation/view/form/media/drop_zone.js|backend/neti_foundation/view/form/optional/field.js|backend/neti_foundation/view/store/variant.js|backend/neti_foundation/view/form/field/VariantSearch.js|backend/neti_foundation/extend/header/css.tpl' in Smarty/sysplugins/smarty_internal_templatebase.php on line 127</h3>
<h3>Stack trace:</h3>
<div style="overflow:auto;">
<pre>#0 Enlight/View/Default.php(274): Smarty_Internal_TemplateBase->fetch()
#1 Enlight/Controller/Plugins/ViewRenderer/Bootstrap.php(216): Enlight_View_Default->render(Object(Enlight_Template_Default))
#2 Enlight/Controller/Plugins/ViewRenderer/Bootstrap.php(242): Enlight_Controller_Plugins_ViewRenderer_Bootstrap->renderTemplate(Object(Enlight_Template_Default))
#3 Enlight/Controller/Plugins/ViewRenderer/Bootstrap.php(136): Enlight_Controller_Plugins_ViewRenderer_Bootstrap->render()
#4 [internal function]: Enlight_Controller_Plugins_ViewRenderer_Bootstrap->onPostDispatch(Object(Enlight_Controller_ActionEventArgs))
#5 Enlight/Event/Handler/Default.php(91): call_user_func(Array, Object(Enlight_Controller_ActionEventArgs))
#6 Enlight/Event/EventManager.php(210): Enlight_Event_Handler_Default->execute(Object(Enlight_Controller_ActionEventArgs))
#7 Enlight/Controller/Action.php(201): Enlight_Event_EventManager->notify('Enlight_Control...', Object(Enlight_Controller_ActionEventArgs))
#8 Enlight/Controller/Dispatcher/Default.php(523): Enlight_Controller_Action->dispatch('loadAction')
#9 Enlight/Controller/Front.php(227): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp))
#10 Shopware/Kernel.php(148): Enlight_Controller_Front->dispatch()
#11 vendor/symfony/http-kernel/HttpCache/HttpCache.php(492): Shopware\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#12 Shopware/Components/HttpCache/AppCache.php(255): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL)
#13 vendor/symfony/http-kernel/HttpCache/HttpCache.php(263): Shopware\Components\HttpCache\AppCache->forward(Object(Symfony\Component\HttpFoundation\Request), true)
#14 Shopware/Components/HttpCache/AppCache.php(103): Symfony\Component\HttpKernel\HttpCache\HttpCache->pass(Object(Symfony\Component\HttpFoundation\Request), true)
#15 shopware.php(101): Shopware\Components\HttpCache\AppCache->handle(Object(Symfony\Component\HttpFoundation\Request))
#16 {main}</pre>
</div>
<div class="doublespace"> </div>

Die Dateien die er laut dem Fehler nicht öffnen kann sind vorhanden und genug Lese/Schreibrechte hat der webserver (www-data:www-data 0644)

Den cache über die Konsole leeren hat nicht geholfen (var/cache/clear_cache.sh)

Leider weiß ich nicht mehr was ich machen könnte.