YamlGuiDashboardBlockService::validateBlock() must be compatible with Sonata\BlockBundle\Block\BlockAdminServiceInterface::validateBlock

[netfarma]

Hi.
I have problem in integration with Sonata

Fatal error: Declaration of Sensi\Bundle\YamlGuiBundle\Block\YamlGuiDashboardBlockService::validateBlock() must be compatible with Sonata\BlockBundle\Block\BlockAdminServiceInterface::validateBlock(Sonata\CoreBundle\Validator\ErrorElement $errorElement, Sonata\BlockBundle\Model\BlockInterface $block) in C:\www\damyrade\vendor\sensi\sensi-yaml-gui-bundle\Sensi\Bundle\YamlGuiBundle\Block\YamlGuiDashboardBlockService.php on line 64

Sonata Admin version from composer:
"sonata-project/admin-bundle": "~2.4@dev",
.....
"sonata-project/core-bundle": "~2.3@dev,>=2.3.1",

PHP: 5.5.12

If I change file https://github.com/sensi/SensiYamlGuiBundle/blob/master/Block/YamlGuiDashboardBlockService.php
replacing
use Sonata\AdminBundle\Validator\ErrorElement;
with
use Sonata\CoreBundle\Validator\ErrorElement;
everything seams to be OK

BR