Unrecognized option "form" under "twig"

[xiranst]

according the installation steps, i got this error message after clear the cache.
ps: i didn't add the jms_di_extra configuration in config.yml

InvalidConfigurationException in ArrayNode.php line 317:
Unrecognized option "form" under "twig"

in ArrayNode.php line 317
at ArrayNode->normalizeValue(array('form' => array('resources' => array('Padam87AttributeBundle:Form:attributeCollection.html.twig')))) in BaseNode.php line 264
at BaseNode->normalize(array('form' => array('resources' => array('Padam87AttributeBundle:Form:attributeCollection.html.twig')))) in Processor.php line 33
at Processor->process(object(ArrayNode), array(array('debug' => false, 'strict_variables' => false), array('form' => array('resources' => array('Padam87AttributeBundle:Form:attributeCollection.html.twig'))))) in Processor.php line 50
at Processor->processConfiguration(object(Configuration), array(array('debug' => false, 'strict_variables' => false), array('form' => array('resources' => array('Padam87AttributeBundle:Form:attributeCollection.html.twig'))))) in Extension.php line 99
at Extension->processConfiguration(object(Configuration), array(array('debug' => false, 'strict_variables' => false), array('form' => array('resources' => array('Padam87AttributeBundle:Form:attributeCollection.html.twig'))))) in TwigExtension.php line 55
at TwigExtension->load(array(array('debug' => false, 'strict_variables' => false), array('form' => array('resources' => array('Padam87AttributeBundle:Form:attributeCollection.html.twig')))), object(ContainerBuilder)) in MergeExtensionConfigurationPass.php line 55
at MergeExtensionConfigurationPass->process(object(ContainerBuilder)) in MergeExtensionConfigurationPass.php line 39
at MergeExtensionConfigurationPass->process(object(ContainerBuilder)) in Compiler.php line 104
at Compiler->compile(object(ContainerBuilder)) in ContainerBuilder.php line 545
at ContainerBuilder->compile() in Kernel.php line 477
at Kernel->initializeContainer() in Kernel.php line 117
at Kernel->boot() in Kernel.php line 166
at Kernel->handle(object(Request)) in app_dev.php line 48

how to do now?

[Padam87]

This is due to a change in the twig bundle.
This bundle should be updated, but I cannot handle it alone, because my current projects don't use this.
As a quick fix, instead of importing the bundle's config.yml, you can do this:

twig:
    form_themes:
        - 'Padam87AttributeBundle:Form:attributeCollection.html.twig'