TYPO3 Core

After upgrade from 10.4.9 to 10.4.12 i got the following error:

Fri, 25 Dec 2020 09:17:28 +0100 [CRITICAL] request="42945d6a42cae" component="TYPO3.CMS.Core.Error.ProductionExceptionHandler": Core: Exception handler (WEB): Uncaught TYPO3 Exception: Expected to find class "TYPO3\CMS\Core\Context\FileProcessingAspect" in file "/var/www/....de/httpdocs/typo3cms/typo3_src-10.4.12/typo3/sysext/core/Classes/Context/FileProcessingAspect.php" while importing services from resource "../Classes/*", but it was not found! Check the namespace prefix used with the resource. | Symfony\Component\DependencyInjection\Exception\InvalidArgumentException thrown in file /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/vendor/symfony/dependency-injection/Loader/FileLoader.php in line 206. Requested URL: https://www.....de/typo3/index.php?route=%2Fmain&token=--AnonymizedToken-- - {"TYPO3_MODE":"BE","exception":"Symfony\\Component\\DependencyInjection\\Exception\\InvalidArgumentException: Expected to find class \"TYPO3\\CMS\\Core\\Context\\FileProcessingAspect\" in file \"/var/www/....de/httpdocs/typo3cms/typo3_src-10.4.12/typo3/sysext/core/Classes/Context/FileProcessingAspect.php\" while importing services from resource \"../Classes/*\", but it was not found! Check the namespace prefix used with the resource. in /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/vendor/symfony/dependency-injection/Loader/FileLoader.php:206\nStack trace:\n#0 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/vendor/symfony/dependency-injection/Loader/FileLoader.php(99): Symfony\\Component\\DependencyInjection\\Loader\\FileLoader->findClasses('TYPO3\\\\CMS\\\\Core\\\\', '../Classes/*', Array)\n#1 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(611): Symfony\\Component\\DependencyInjection\\Loader\\FileLoader->registerClasses(Object(Symfony\\Component\\DependencyInjection\\Definition), 'TYPO3\\\\CMS\\\\Core\\\\', '../Classes/*', NULL)\n#2 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(233): Symfony\\Component\\DependencyInjection\\Loader\\YamlFileLoader->parseDefinition('TYPO3\\\\CMS\\\\Core\\\\', Array, '/var/www/vhosts...', Array)\n#3 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(153): Symfony\\Component\\DependencyInjection\\Loader\\YamlFileLoader->parseDefinitions(Array, '/var/www/vhosts...')\n#4 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/typo3/sysext/core/Classes/DependencyInjection/ContainerBuilder.php(119): Symfony\\Component\\DependencyInjection\\Loader\\YamlFileLoader->load('Services.yaml')\n#5 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/typo3/sysext/core/Classes/DependencyInjection/ContainerBuilder.php(84): TYPO3\\CMS\\Core\\DependencyInjection\\ContainerBuilder->buildContainer(Object(TYPO3\\CMS\\Core\\Package\\PackageManager), Object(TYPO3\\CMS\\Core\\DependencyInjection\\ServiceProviderRegistry))\n#6 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/typo3/sysext/core/Classes/Core/Bootstrap.php(141): TYPO3\\CMS\\Core\\DependencyInjection\\ContainerBuilder->createDependencyInjectionContainer(Object(TYPO3\\CMS\\Core\\Package\\PackageManager), Object(TYPO3\\CMS\\Core\\Cache\\Frontend\\PhpFrontend), false)\n#7 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/typo3/index.php(25): TYPO3\\CMS\\Core\\Core\\Bootstrap::init(Object(Composer\\Autoload\\ClassLoader))\n#8 /var/www/....de/httpdocs/typo3cms/typo3_src-10.4.9/typo3/index.php(26): {closure}()\n#9 {main}"}