The namespace was missing

Author: LordPachelbel

quick_tour/flex_recipes.rst

@@ -177,6 +177,8 @@ rich API for a ``product`` table? Create a ``Product`` entity and give it the
 
     // src/Entity/Product.php
     // ...
+    
+    namespace App\Entity;
 
     use ApiPlatform\Core\Annotation\ApiResource;
     use Doctrine\ORM\Mapping as ORM;