Zend certified PHP/Magento developer

Backend error after theme install

i have a big Problem. I have installed a theme and as soon as I log into the backend the following error comes up.

Error: Cannot instantiate interface MagentoFrameworkFilesystemDriverInterface in /var/www/html/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php:121
Stack trace:
#0 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Compiled.php(108): MagentoFrameworkObjectManagerFactoryAbstractFactory->createObject()
#1 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Compiled.php(150): MagentoFrameworkObjectManagerFactoryCompiled->create()
#2 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Compiled.php(79): MagentoFrameworkObjectManagerFactoryCompiled->get()
#3 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Compiled.php(150): MagentoFrameworkObjectManagerFactoryCompiled->create()
#4 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Compiled.php(79): MagentoFrameworkObjectManagerFactoryCompiled->get()
#5 /var/www/html/vendor/magento/framework/ObjectManager/ObjectManager.php(70): MagentoFrameworkObjectManagerFactoryCompiled->create()
#6 /var/www/html/vendor/magento/framework/Interception/PluginList/PluginList.php(174): MagentoFrameworkObjectManagerObjectManager->get()
#7 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(133): MagentoFrameworkInterceptionPluginListPluginList->getPlugin()
#8 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(153): MagentoFrameworkDataFormFormKeyValidatorInterceptor->MagentoFrameworkInterception{closure}()
#9 /var/www/html/generated/code/Magento/Framework/Data/Form/FormKey/Validator/Interceptor.php(23): MagentoFrameworkDataFormFormKeyValidatorInterceptor->___callPlugins()
#10 /var/www/html/vendor/magento/module-backend/App/Action/Plugin/Authentication.php(158): MagentoFrameworkDataFormFormKeyValidatorInterceptor->validate()
#11 /var/www/html/vendor/magento/module-backend/App/Action/Plugin/Authentication.php(127): MagentoBackendAppActionPluginAuthentication->_processNotLoggedInUser()
#12 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(135): MagentoBackendAppActionPluginAuthentication->aroundDispatch()
#13 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(153): MagentoBackendControllerAdminhtmlIndexIndexInterceptor->MagentoFrameworkInterception{closure}()
#14 /var/www/html/generated/code/Magento/Backend/Controller/Adminhtml/Index/Index/Interceptor.php(32): MagentoBackendControllerAdminhtmlIndexIndexInterceptor->___callPlugins()
#15 /var/www/html/vendor/magento/framework/App/FrontController.php(245): MagentoBackendControllerAdminhtmlIndexIndexInterceptor->dispatch()
#16 /var/www/html/vendor/magento/framework/App/FrontController.php(212): MagentoFrameworkAppFrontController->getActionResponse()
#17 /var/www/html/vendor/magento/framework/App/FrontController.php(147): MagentoFrameworkAppFrontController->processRequest()
#18 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(58): MagentoFrameworkAppFrontController->dispatch()
#19 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(138): MagentoFrameworkAppFrontControllerInterceptor->___callParent()
#20 /var/www/html/vendor/magento/framework/Interception/Interceptor.php(153): MagentoFrameworkAppFrontControllerInterceptor->MagentoFrameworkInterception{closure}()
#21 /var/www/html/generated/code/Magento/Framework/App/FrontController/Interceptor.php(23): MagentoFrameworkAppFrontControllerInterceptor->___callPlugins()
#22 /var/www/html/vendor/magento/framework/App/Http.php(116): MagentoFrameworkAppFrontControllerInterceptor->dispatch()
#23 /var/www/html/vendor/magento/framework/App/Bootstrap.php(264): MagentoFrameworkAppHttp->launch()
#24 /var/www/html/pub/index.php(30): MagentoFrameworkAppBootstrap->run()
#25 {main}

Can anyone help me? I have magento-2.4.4 installed.