diff -ru src/Symfony/Component/Serializer/Encoder/XmlEncoder.php src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
--- src/Symfony/Component/Serializer/Encoder/XmlEncoder.php	2024-04-23 13:25:02.290176650 +0000
+++ src/Symfony/Component/Serializer/Encoder/XmlEncoder.php	2024-04-23 13:25:10.216454218 +0000
@@ -401,7 +401,7 @@
             return $this->appendNode($parentNode, $data, $format, $context, 'data');
         }
 
-        throw new NotEncodableValueException('An unexpected value could not be serialized: '.(!\is_resource($data) ? var_export($data, true) : sprintf('%s resource', get_resource_type($data))));
+        throw new NotEncodableValueException('An unexpected value could not be serialized: '.(!\is_resource($data) ? var_export($data, true) : sprintf('"%s" resource', get_resource_type($data))));
     }
 
     /**