ibexa_fieldtype_page:
    blocks:
        my_block:
            name: MyBlock
            category: default
            thumbnail: /bundles/ibexaicons/img/all-icons.svg#edit
            views:
                default:
                    name: Default block layout
                    template: my_block.html.twig
                    priority: -255
            attributes:
                embed_content:
                    type: embed
                    name: Content
                    validators:
                        content_type:
                            message: You must select a folder
                            options:
                                types: folder 

Argument 1 passed to Ibexa\Core\Repository\SiteAccessAware\ContentService::loadContent() must be of the type int, string given, called in /var/www/html/vendor/ibexa/fieldtype-page/src/lib/Validator/Constraints/ContentTypeValidator.php on line 47