Fehlermeldung Theme Manager

Hallo,

hier über die Suche habe ich diese Fehlermeldung leider nicht gefunden.

Wenn ich den Theme Manager aufrufe, kommt erst mal die Meldung 500 - Internal Server Error.
Wenn ich danach auf “Themes neu laden” klicke, kommt folgende Fehlermeldung:

503 Service Unavailable
 

Ups! Ein Fehler ist aufgetreten! Die nachfolgenden Hinweise sollten Ihnen weiterhelfen. Zend_Session::start() - /www/htdocs/v12345/reenactment-werkstatt.de/engine/Library/Zend/Session.php(Line:468): Error #2 session_start(): Failed to decode session object. Session has been destroyed in engine/Library/Zend/Session.php on line 481 Stack trace: #0 engine/Shopware/Plugins/Default/Backend/Auth/Bootstrap.php(374): Zend_Session::start(Array) #1 engine/Library/Enlight/Event/Handler/Plugin.php(145): Shopware_Plugins_Backend_Auth_Bootstrap->onInitResourceBackendSession(Object(Enlight_Event_EventArgs)) #2 engine/Library/Enlight/Event/EventManager.php(251): Enlight_Event_Handler_Plugin->execute(Object(Enlight_Event_EventArgs)) #3 engine/Shopware/Components/DependencyInjection/Container.php(204): Enlight_Event_EventManager->notifyUntil('Enlight_Bootstr...', Object(Enlight_Event_EventArgs)) #4 engine/Shopware/Components/DependencyInjection/Container.php(160): Shopware\Components\DependencyInjection\Container->doLoad('backendsession', 'backendsession') #5 engine/Shopware/Plugins/Default/Backend/Auth/Bootstrap.php(391): Shopware\Components\DependencyInjection\Container->load('backendsession') #6 engine/Library/Enlight/Event/Handler/Plugin.php(145): Shopware_Plugins_Backend_Auth_Bootstrap->onInitResourceAuth(Object(Enlight_Event_EventArgs)) #7 engine/Library/Enlight/Event/EventManager.php(251): Enlight_Event_Handler_Plugin->execute(Object(Enlight_Event_EventArgs)) #8 engine/Shopware/Components/DependencyInjection/Container.php(204): Enlight_Event_EventManager->notifyUntil('Enlight_Bootstr...', Object(Enlight_Event_EventArgs)) #9 engine/Shopware/Components/DependencyInjection/Container.php(141): Shopware\Components\DependencyInjection\Container->doLoad('auth', 'auth', 1) #10 engine/Shopware/Plugins/Default/Backend/Auth/Bootstrap.php(226): Shopware\Components\DependencyInjection\Container->get('auth') #11 engine/Shopware/Plugins/Default/Backend/Auth/Bootstrap.php(207): Shopware_Plugins_Backend_Auth_Bootstrap->checkAuth() #12 engine/Library/Enlight/Event/Handler/Plugin.php(145): Shopware_Plugins_Backend_Auth_Bootstrap->onPreDispatchBackend(Object(Enlight_Controller_ActionEventArgs)) #13 engine/Library/Enlight/Event/EventManager.php(214): Enlight_Event_Handler_Plugin->execute(Object(Enlight_Controller_ActionEventArgs)) #14 engine/Library/Enlight/Controller/Action.php(170): Enlight_Event_EventManager->notify('Enlight_Control...', Object(Enlight_Controller_ActionEventArgs)) #15 engine/Library/Enlight/Controller/Dispatcher/Default.php(478): Enlight_Controller_Action->dispatch('listAction') #16 engine/Library/Enlight/Controller/Front.php(228): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp)) #17 engine/Shopware/Kernel.php(188): Enlight_Controller_Front->dispatch() #18 vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(102): Shopware\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 vendor/symfony/http-kernel/HttpCache/HttpCache.php(453): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(Shopware\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 engine/Shopware/Components/HttpCache/AppCache.php(261): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL) #21 vendor/symfony/http-kernel/HttpCache/HttpCache.php(238): Shopware\Components\HttpCache\AppCache->forward(Object(Symfony\Component\HttpFoundation\Request), true) #22 engine/Shopware/Components/HttpCache/AppCache.php(102): Symfony\Component\HttpKernel\HttpCache\HttpCache->pass(Object(Symfony\Component\HttpFoundation\Request), true) #23 shopware.php(122): Shopware\Components\HttpCache\AppCache->handle(Object(Symfony\Component\HttpFoundation\Request)) #24 {main}  

Kann mir da jemand helfen?

Viele Grüße
Tom

Hat keiner einen Tipp für mich?
Ich kenne mich damit leider nicht wirklich aus  Crying