Alguém pode me explicar esse erro?
Exception #0 (Exception): Notice: Undefined index: id in /home/staging/vendor/magento/module-config/Model/Config/Structure/Element/Iterator.php on line 59
#0 /home/staging/vendor/magento/module-config/Model/Config/Structure/Element/Iterator.php(59): Magento\Framework\App\ErrorHandler->handler(8, 'Undefined index...', '/home/asconveyo...', 59, Array)
#1 /home/staging/vendor/magento/module-config/Model/Config/Structure.php(92): Magento\Config\Model\Config\Structure\Element\Iterator->setElements(Array, 'default')
#2 /home/staging/var/generation/Magento/Config/Model/Config/Structure/Interceptor.php(24): Magento\Config\Model\Config\Structure->getTabs()
#3 /home/staging/vendor/magento/module-config/Model/Config/Structure.php(135): Magento\Config\Model\Config\Structure\Interceptor->getTabs()
#4 /home/staging/var/generation/Magento/Config/Model/Config/Structure/Interceptor.php(63): Magento\Config\Model\Config\Structure->getFirstSection()
#5 /home/staging/vendor/magento/module-config/Controller/Adminhtml/System/AbstractConfig.php(57): Magento\Config\Model\Config\Structure\Interceptor->getFirstSection()
#6 /home/staging/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Config\Controller\Adminhtml\System\AbstractConfig->dispatch(Object(Magento\Framework\App\Request\Http))
#7 /home/staging/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor->___callParent('dispatch', Array)
#8 /home/staging/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Config\\...', 'dispatch', Object(Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor), Array, 'adminAuthentica...')
#9 /home/staging/vendor/magento/module-backend/App/Action/Plugin/Authentication.php(143): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#10 /home/staging/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Backend\App\Action\Plugin\Authentication->aroundDispatch(Object(Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#11 /home/staging/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Config\\...', 'dispatch', Object(Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor), Array, 'adminMassaction...')
#12 /home/staging/vendor/magento/module-backend/App/Action/Plugin/MassactionKey.php(33): Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#13 /home/staging/vendor/magento/framework/Interception/Interceptor.php(142): Magento\Backend\App\Action\Plugin\MassactionKey->aroundDispatch(Object(Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#14 /home/staging/var/generation/Magento/Config/Controller/Adminhtml/System/Config/Index/Interceptor.php(39): Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor->___callPlugins('dispatch', Array, Array)
#15 /home/staging/vendor/magento/framework/App/FrontController.php(55): Magento\Config\Controller\Adminhtml\System\Config\Index\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#16 /home/staging/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http))
#17 /home/staging/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array)
#18 /home/staging/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'install')
#19 /home/staging/vendor/magento/framework/Module/Plugin/DbStatusValidator.php(69): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#20 /home/staging/vendor/magento/framework/Interception/Interceptor.php(142): Magento\Framework\Module\Plugin\DbStatusValidator->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#21 /home/staging/var/generation/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array)
#22 /home/staging/vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#23 /home/staging/vendor/magento/framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#24 /home/staging/index.php(42): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#25 {main}