Backoffice Product Image Detail Box InvalidArgumentException

[jaydeeat]

On our Prestashop 1.7.2.4 installation we have a problem with changing product image in backoffice. if we click on an product image in backoffice the info box left is empty. on debug we get http 500 error with this informations

(1/1) InvalidArgumentException Could not load type "form"
in FormRegistry.php (line 85)
at FormRegistry->getType('form')in FormFactory.php (line 74)
at FormFactory->createNamedBuilder('form_image', 'form', array('id' => 3, 'id_product' => '3', 'position' => '1', 'cover' => true, 'legend' => array(''), 'format' => 'jpg', 'base_image_url' => '/img/p/3/3'), array('csrf_protection' => false, 'data' => array('id' => 3, 'id_product' => '3', 'position' => '1', 'cover' => true, 'legend' => array(''), 'format' => 'jpg', 'base_image_url' => '/img/p/3/3')))in ProductImageController.php (line 131)
at ProductImageController->formAction('3', object(Request))
at call_user_func_array(array(object(ProductImageController), 'formAction'), array('3', object(Request)))in HttpKernel.php (line 153)
at HttpKernel->handleRaw(object(Request), 1)in HttpKernel.php (line 68)
at HttpKernel->handle(object(Request), 1, false)in Kernel.php (line 169)
at Kernel->handle(object(Request), 1, false)in index.php (line 93)

 

Any solutions?