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Backendfehler nach Entwickleroptionen

Backendfehler nach Entwickleroptionen

Hallo!
Ich kann mich, nachdem ich die Entwickleroptionen wie Systemlinks --> Ja angewendet habe, nicht mehr ins Backend einloggen.

Frontend läuft - aber das Backend zeigt folgenden Fehler an:

TypeError: Argument 1 passed to Magento\Backend\Model\Menu::add() must be an instance of Magento\Backend\Model\Menu\Item, null given, called in /var/www/x1/html/app/code/Aitoc/Core/Plugin/BackendMenu/Builder.php on line 163 and defined in /var/www/x1/html/vendor/magento/module-backend/Model/Menu.php:77
Stack trace:
#0 /var/www/x1/html/app/code/Aitoc/Core/Plugin/BackendMenu/Builder.php(163): Magento\Backend\Model\Menu->add()
#1 /var/www/x1/html/app/code/Aitoc/Core/Plugin/BackendMenu/Builder.php(119): Aitoc\Core\Plugin\BackendMenu\Builder->render()
#2 /var/www/x1/html/app/code/Aitoc/Core/Plugin/BackendMenu/Builder.php(91): Aitoc\Core\Plugin\BackendMenu\Builder->buildMenu()
#3 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(146): Aitoc\Core\Plugin\BackendMenu\Builder->afterGetResult()
#4 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Backend\Model\Menu\Builder\Interceptor->Magento\Framework\Interception\{closure}()
#5 /var/www/x1/html/generated/code/Magento/Backend/Model/Menu/Builder/Interceptor.php(23): Magento\Backend\Model\Menu\Builder\Interceptor->___callPlugins()
#6 /var/www/x1/html/vendor/magento/module-backend/Model/Menu/Config.php(153): Magento\Backend\Model\Menu\Builder\Interceptor->getResult()
#7 /var/www/x1/html/vendor/magento/module-backend/Model/Menu/Config.php(116): Magento\Backend\Model\Menu\Config->_initMenu()
#8 /var/www/x1/html/vendor/magento/module-backend/Model/Url.php(365): Magento\Backend\Model\Menu\Config->getMenu()
#9 /var/www/x1/html/vendor/magento/module-backend/Model/Url.php(325): Magento\Backend\Model\Url->_getMenu()
#10 /var/www/x1/html/app/code/Printq/X1/App/Action/Plugin/Authentication.php(228): Magento\Backend\Model\Url->getStartupPageUrl()
#11 /var/www/x1/html/app/code/Printq/X1/App/Action/Plugin/Authentication.php(158): Printq\X1\App\Action\Plugin\Authentication->_redirectIfNeededAfterLogin()
#12 /var/www/x1/html/app/code/Printq/X1/App/Action/Plugin/Authentication.php(125): Printq\X1\App\Action\Plugin\Authentication->_processNotLoggedInUser()
#13 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(135): Printq\X1\App\Action\Plugin\Authentication->aroundDispatch()
#14 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor->Magento\Framework\Interception\{closure}()
#15 /var/www/x1/html/generated/code/Magento/Backend/Controller/Adminhtml/Index/Index/Interceptor.php(32): Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor->___callPlugins()
#16 /var/www/x1/html/vendor/magento/framework/App/FrontController.php(245): Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor->dispatch()
#17 /var/www/x1/html/vendor/magento/framework/App/FrontController.php(212): Magento\Framework\App\FrontController->getActionResponse()
#18 /var/www/x1/html/vendor/magento/framework/App/FrontController.php(147): Magento\Framework\App\FrontController->processRequest()
#19 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\FrontController->dispatch()
#20 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\FrontController\Interceptor->___callParent()
#21 /var/www/x1/html/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}()
#22 /var/www/x1/html/generated/code/Magento/Framework/App/FrontController/Interceptor.php(23): Magento\Framework\App\FrontController\Interceptor->___callPlugins()
#23 /var/www/x1/html/vendor/magento/framework/App/Http.php(116): Magento\Framework\App\FrontController\Interceptor->dispatch()
#24 /var/www/x1/html/vendor/magento/framework/App/Bootstrap.php(264): Magento\Framework\App\Http->launch()
#25 /var/www/x1/html/pub/index.php(29): Magento\Framework\App\Bootstrap->run()
#26 {main}

Ich habe schon das System neu compiliert - aber keine Änderung:

rm -rf generated/ var/view_preprocessed/ var/composer_home/cache/
var/cache/ var/page_cache/
php bin/magento maintenance:enable
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f
php bin/magento maintenance:disable
php bin/magento cache:flush

Jemand eine Idee?