From 414583607c672b91c34061205218851100cc7434 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Fri, 16 Jan 2015 16:35:16 +0100
Subject: [PATCH] [Form] Improved exception message if the data class is not
 found

---
 src/Symfony/Component/Form/FormConfigBuilder.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Form/FormConfigBuilder.php b/src/Symfony/Component/Form/FormConfigBuilder.php
index 1d70a49644..d8ebed7403 100644
--- a/src/Symfony/Component/Form/FormConfigBuilder.php
+++ b/src/Symfony/Component/Form/FormConfigBuilder.php
@@ -193,7 +193,7 @@ class FormConfigBuilder implements FormConfigBuilderInterface
         self::validateName($name);
 
         if (null !== $dataClass && !class_exists($dataClass)) {
-            throw new InvalidArgumentException(sprintf('The data class "%s" is not a valid class.', $dataClass));
+            throw new InvalidArgumentException(sprintf('Class "%s" not found. Is the "data_class" form option set correctly?', $dataClass));
         }
 
         $this->name = (string) $name;