Exception Thrown When Opening Customer

[supanatral]

I'm currently migrating from Magento 1.9 to 2.1 and I'm having an issue when I browse my customer list and click to open a customer.

Here's the error:

1 exception(s):
Exception #0 (Magento\Framework\Exception\LocalizedException): The requested component ("Null") is not found. Before using, you must add the implementation.

Exception #0 (Magento\Framework\Exception\LocalizedException): The requested component ("Null") is not found. Before using, you must add the implementation.
#0 /var/www/clients/client0/web58/web/vendor/magento/module-ui/Model/Manager.php(207): Magento\Framework\View\Element\UiComponent\Config\Provider\Component\Definition->getComponentData('Null')
#1 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Element/UiComponentFactory.php(187): Magento\Ui\Model\Manager->createRawComponentData('Null')
#2 /var/www/clients/client0/web58/web/vendor/magento/module-ui/Component/Form/Field.php(83): Magento\Framework\View\Element\UiComponentFactory->create('unsubscribe', 'Null', Array)
#3 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Generator/UiComponent.php(148): Magento\Ui\Component\Form\Field->prepare()
#4 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Generator/UiComponent.php(145): Magento\Framework\View\Layout\Generator\UiComponent->prepareComponent(Object(Magento\Ui\Component\Form\Field))
#5 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Generator/UiComponent.php(145): Magento\Framework\View\Layout\Generator\UiComponent->prepareComponent(Object(Magento\Ui\Component\Form\Fieldset))
#6 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Generator/UiComponent.php(126): Magento\Framework\View\Layout\Generator\UiComponent->prepareComponent(Object(Magento\Ui\Component\Form))
#7 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Generator/UiComponent.php(93): Magento\Framework\View\Layout\Generator\UiComponent->generateComponent(Object(Magento\Framework\View\Layout\Data\Structure), 'customer_form', Array, Object(Magento\Framework\View\Layout\Interceptor))
#8 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/GeneratorPool.php(86): Magento\Framework\View\Layout\Generator\UiComponent->process(Object(Magento\Framework\View\Layout\Reader\Context), Object(Magento\Framework\View\Layout\Generator\Context))
#9 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout.php(327): Magento\Framework\View\Layout\GeneratorPool->process(Object(Magento\Framework\View\Layout\Reader\Context), Object(Magento\Framework\View\Layout\Generator\Context))
#10 /var/www/clients/client0/web58/web/var/generation/Magento/Framework/View/Layout/Interceptor.php(89): Magento\Framework\View\Layout->generateElements()
#11 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Builder.php(129): Magento\Framework\View\Layout\Interceptor->generateElements()
#12 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Page/Builder.php(55): Magento\Framework\View\Layout\Builder->generateLayoutBlocks()
#13 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout/Builder.php(65): Magento\Framework\View\Page\Builder->generateLayoutBlocks()
#14 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout.php(244): Magento\Framework\View\Layout\Builder->build()
#15 /var/www/clients/client0/web58/web/vendor/magento/framework/View/Layout.php(859): Magento\Framework\View\Layout->build()
#16 /var/www/clients/client0/web58/web/var/generation/Magento/Framework/View/Layout/Interceptor.php(414): Magento\Framework\View\Layout->getBlock('menu')
#17 /var/www/clients/client0/web58/web/vendor/magento/module-backend/Model/View/Result/Page.php(59): Magento\Framework\View\Layout\Interceptor->getBlock('menu')
#18 /var/www/clients/client0/web58/web/var/generation/Magento/Backend/Model/View/Result/Page/Interceptor.php(24): Magento\Backend\Model\View\Result\Page->setActiveMenu('Magento_Custome...')
#19 /var/www/clients/client0/web58/web/vendor/magento/module-customer/Controller/Adminhtml/Index/Edit.php(55): Magento\Backend\Model\View\Result\Page\Interceptor->setActiveMenu('Magento_Custome...')
#20 /var/www/clients/client0/web58/web/var/generation/Magento/Customer/Controller/Adminhtml/Index/Edit/Interceptor.php(24): Magento\Customer\Controller\Adminhtml\Index\Edit->execute()
#21 /var/www/clients/client0/web58/web/vendor/magento/framework/App/Action/Action.php(102): Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor->execute()
#22 /var/www/clients/client0/web58/web/vendor/magento/module-backend/App/AbstractAction.php(226): Magento\Framework\App\Action\Action->dispatch(Object(Magento\Framework\App\Request\Http))
#23 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Backend\App\AbstractAction->dispatch(Object(Magento\Framework\App\Request\Http))
#24 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor->___callParent('dispatch', Array)
#25 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Custome...', 'dispatch', Object(Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor), Array, 'adminAuthentica...')
#26 /var/www/clients/client0/web58/web/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))
#27 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Backend\App\Action\Plugin\Authentication->aroundDispatch(Object(Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#28 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Custome...', 'dispatch', Object(Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor), Array, 'adminMassaction...')
#29 /var/www/clients/client0/web58/web/vendor/magento/module-backend/App/Action/Plugin/MassactionKey.php(33): Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#30 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Interceptor.php(142): Magento\Backend\App\Action\Plugin\MassactionKey->aroundDispatch(Object(Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#31 /var/www/clients/client0/web58/web/var/generation/Magento/Customer/Controller/Adminhtml/Index/Edit/Interceptor.php(39): Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor->___callPlugins('dispatch', Array, Array)
#32 /var/www/clients/client0/web58/web/vendor/magento/framework/App/FrontController.php(55): Magento\Customer\Controller\Adminhtml\Index\Edit\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#33 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http))
#34 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array)
#35 /var/www/clients/client0/web58/web/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'install')
#36 /var/www/clients/client0/web58/web/vendor/magento/framework/Module/Plugin/DbStatusValidator.php(69): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#37 /var/www/clients/client0/web58/web/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))
#38 /var/www/clients/client0/web58/web/var/generation/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array)
#39 /var/www/clients/client0/web58/web/vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#40 /var/www/clients/client0/web58/web/vendor/magento/framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#41 /var/www/clients/client0/web58/web/index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#42 {main}

Any idea what could be causing this?

[supanatral · Accepted solution]

Found the fix and it was caused by the Magento 1.9.x migration.

If you are experiencing this annoying problem than browse your Magento 2 database and view the "eav_attribute" table.

In my case, I found the single database entry which had "Null" (not to be confused with "NULL") in the "fronted_input" column. All that I needed to do is change "Null" to "text" (without quotes)

I hope this helps the next person who runs into this error