I am receiving the following error when clicking on a product link or accessing the product page. This was done after upgrading from Magento 2.1.6 to 2.2.1.
Also received other errors but resolved them.
1 exception(s): Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'attribute', attribute 'remove': The attribute 'remove' is not allowed. Line: 1010
Element 'attribute', attribute 'ifconfig': The attribute 'ifconfig' is not allowed. Line: 1010
Element 'attribute', attribute 'remove': The attribute 'remove' is not allowed. Line: 1011
Element 'attribute', attribute 'ifconfig': The attribute 'ifconfig' is not allowed. Line: 1011
Element 'referenceBlock', attribute 'as': The attribute 'as' is not allowed. Line: 1048
Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'attribute', attribute 'remove': The attribute 'remove' is not allowed. Line: 1010
Element 'attribute', attribute 'ifconfig': The attribute 'ifconfig' is not allowed. Line: 1010
Element 'attribute', attribute 'remove': The attribute 'remove' is not allowed. Line: 1011
Element 'attribute', attribute 'ifconfig': The attribute 'ifconfig' is not allowed. Line: 1011
Element 'referenceBlock', attribute 'as': The attribute 'as' is not allowed. Line: 1048
0 .../vendor/magento/framework/Config/Dom.php(115): Magento\Framework\Config\Dom->_initDom('
1 .../vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php(111): Magento\Framework\Config\Dom->__construct('
2 .../vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php(66): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Magento\Framewo...', Array)
3 .../vendor/magento/framework/ObjectManager/ObjectManager.php(56): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create('Magento\Framewo...', Array)
4 .../vendor/magento/framework/Config/DomFactory.php(42): Magento\Framework\ObjectManager\ObjectManager->create('Magento\Framewo...', Array)
5 .../vendor/magento/framework/View/Model/Layout/Update/Validator.php(125): Magento\Framework\Config\DomFactory->createDom(Array)
6 .../vendor/magento/framework/View/Model/Layout/Merge.php(461): Magento\Framework\View\Model\Layout\Update\Validator->isValid('
7 .../vendor/magento/framework/View/Model/Layout/Merge.php(442): Magento\Framework\View\Model\Layout\Merge->_validateMergedLayout('LAYOUT_frontend...', '\n
8 .../generated/code/Magento/Framework/View/Model/Layout/Merge/Interceptor.php(193): Magento\Framework\View\Model\Layout\Merge->load(Array)
9 .../vendor/magento/framework/View/Layout/Builder.php(86): Magento\Framework\View\Model\Layout\Merge\Interceptor->load()
10 .../vendor/magento/framework/View/Layout/Builder.php(63): Magento\Framework\View\Layout\Builder->loadLayoutUpdates()
11 .../vendor/magento/framework/View/Layout.php(254): Magento\Framework\View\Layout\Builder->build()
12 .../vendor/magento/framework/View/Layout.php(875): Magento\Framework\View\Layout->build()
13 .../generated/code/Magento/Framework/View/Layout/Interceptor.php(414): Magento\Framework\View\Layout->getBlock('page_content_he...')
14 .../vendor/magento/module-cms/Helper/Page.php(171): Magento\Framework\View\Layout\Interceptor->getBlock('page_content_he...')
15 .../vendor/magento/module-cms/Controller/Noroute/Index.php(44): Magento\Cms\Helper\Page->prepareResultPage(Object(Magento\Cms\Controller\Noroute\Index\Interceptor), 'no-route')
16 .../generated/code/Magento/Cms/Controller/Noroute/Index/Interceptor.php(24): Magento\Cms\Controller\Noroute\Index->execute()
17 .../vendor/magento/framework/App/Action/Action.php(107): Magento\Cms\Controller\Noroute\Index\Interceptor->execute()
18 .../vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\Action\Action->dispatch(Object(Magento\Framework\App\Request\Http))
19 .../vendor/magento/framework/Interception/Interceptor.php(138): Magento\Cms\Controller\Noroute\Index\Interceptor->___callParent('dispatch', Array)
20 .../vendor/magento/framework/Interception/Interceptor.php(153): Magento\Cms\Controller\Noroute\Index\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Framework\App\Request\Http))
21 .../generated/code/Magento/Cms/Controller/Noroute/Index/Interceptor.php(39): Magento\Cms\Controller\Noroute\Index\Interceptor->___callPlugins('dispatch', Array, Array)
22 .../vendor/magento/framework/App/FrontController.php(55): Magento\Cms\Controller\Noroute\Index\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
23 .../vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http))
24 .../vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array)
25 .../vendor/magento/module-store/App/FrontController/Plugin/RequestPreprocessor.php(94): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Framework\App\Request\Http))
26 .../vendor/magento/framework/Interception/Interceptor.php(135): Magento\Store\App\FrontController\Plugin\RequestPreprocessor->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
27 .../vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php(73): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Framework\App\Request\Http))
28 .../vendor/magento/framework/Interception/Interceptor.php(135): Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
29 .../vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception{closure}(Object(Magento\Framework\App\Request\Http))
30 .../generated/code/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, NULL)
31 .../vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http)) 32 .../vendor/magento/framework/App/Bootstrap.php(256): Magento\Framework\App\Http->launch() 33 .../index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http)) 34 {main}/