Entity form types breaks the documentation about nelmioapidocbundle HOT 8 CLOSED

The required option "class" is missing.
in /var/www/pm/vendor/symfony/symfony/src/Symfony/Component/OptionsResolver/OptionsResolver.php at line 278    
at OptionsResolver ->validateOptionsCompleteness (array()) 
in /var/www/pm/vendor/symfony/symfony/src/Symfony/Component/OptionsResolver/OptionsResolver.php at line 220    
at OptionsResolver ->resolve (array()) 
in /var/www/pm/vendor/symfony/symfony/src/Symfony/Component/Form/ResolvedFormType.php at line 115    
at ResolvedFormType ->createBuilder (object(FormFactory), 'entity', array(), null) 
in /var/www/pm/vendor/symfony/symfony/src/Symfony/Component/Form/FormFactory.php at line 87    
at FormFactory ->createNamedBuilder ('entity', object(EntityType), null, array(), null) 
in /var/www/pm/vendor/symfony/symfony/src/Symfony/Component/Form/FormFactory.php at line 67    
at FormFactory ->createBuilder (object(EntityType), null, array(), null) 
in /var/www/pm/vendor/symfony/symfony/src/Symfony/Component/Form/FormFactory.php at line 39    
at FormFactory ->create (object(EntityType)) 
in /var/www/pm/src/Nelmio/ApiDocBundle/Parser/FormTypeParser.php at line 101    
at FormTypeParser ->parseForm (object(Form)) 
in /var/www/pm/src/Nelmio/ApiDocBundle/Parser/FormTypeParser.php at line 76    
at FormTypeParser ->parse ('Frisbee\ProductBundle\Form\Type\ProductApiCreateType') 
in /var/www/pm/src/Nelmio/ApiDocBundle/Extractor/ApiDocExtractor.php at line 251    
at ApiDocExtractor ->extractData (object(ApiDoc), object(Route), object(ReflectionMethod)) 
in /var/www/pm/src/Nelmio/ApiDocBundle/Extractor/ApiDocExtractor.php at line 94    
at ApiDocExtractor ->all () 
in /var/www/pm/src/Nelmio/ApiDocBundle/Controller/ApiDocController.php at line 21    
at ApiDocController ->indexAction () 
at call_user_func_array (array(object(ApiDocController), 'indexAction'), array()) 
in /var/www/pm/app/bootstrap.php.cache at line 1426    
at HttpKernel ->handleRaw (object(Request), '1') 
in /var/www/pm/app/bootstrap.php.cache at line 1390    
at HttpKernel ->handle (object(Request), '1', true) 
in /var/www/pm/app/bootstrap.php.cache at line 1566    
at HttpKernel ->handle (object(Request), '1', true) 
in /var/www/pm/app/bootstrap.php.cache at line 617    
at Kernel ->handle (object(Request)) 
in /var/www/pm/web/api_dev.php at line 19