Magento 2: Cannot open the Product Detail Page

Question

I'm trying to open the product detail page from the listing page but its not working, and its showing the below error:

2 exception(s):
Exception #0 (Magento\Framework\Exception\LocalizedException): Invalid block type: Magento\Review\Block\Product\Review
Exception #1 (ReflectionException): Class Magento\Review\Block\Product\Review does not exist

Can anyone please help me to rectify this error?

When I try to open the product page, its not opening and I can see the below error in view-source:

<meta property="og:type" content="product" />
<meta property="og:title" content="<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function getName() on null in /var/www/html/vendor/magento/module-catalog/view/frontend/templates/product/view/opengraph/general.phtml:13
Stack trace:
#0 /var/www/html/vendor/magento/framework/View/TemplateEngine/Php.php(59): include()
#1 /var/www/html/vendor/magento/framework/View/Element/Template.php(271): Magento\Framework\View\TemplateEngine\Php-&gt;render(Object(vendor\module\Block\Index\Index), '/var/www/html/v...', Array)
#2 /var/www/html/vendor/magento/framework/View/Element/Template.php(301): Magento\Framework\View\Element\Template-&gt;fetchView('/var/www/html/v...')
#3 /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php(1094): Magento\Framework\View\Element\Template-&gt;_toHtml()
#4 /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php(1098): Magento\Framework\View\Element\AbstractBlock-&gt;Magento\Framework\View\Element\{closure}()
#5 /var/www/html/vendor/magento/framework/View/Element/AbstractBlock.php(671): Magento\Framework\View\Element\Abst in <b>/var/www/html/vendor/magento/module-catalog/view/frontend/templates/product/view/opengraph/general.phtml</b> on line <b>13</b><br />

Answer 1

try to run the command to re generate class

sudo php bin/magento setup:di:compile

Answer 2

Check the constructor. Problem is with the Constructor params . After fixing it run di:compile

Answer 3

Check Whether Magento\Review\Block\Product\Review is overridden. If so, then cross check the block extends type.

Also, check the catalog_product_view.xml file whether the review block class is mentioned correctly as

<block class="Magento\Review\Block\Product\Review" name="reviews.tab" as="reviews" template="Magento_Review::review.phtml" group="detailed_info" ifconfig="catalog/review/active">

If everything is correctly, Please follow below steps

1) rm -rf var/* pub/static/* generated/* (to remove all cache, static content and generated files)

2) php bin/magento setup:upgrade && php bin/magento setup:di:compile && php bin/magento setup:static-content:deploy -f

Note: Use -f if you are in developer mode.