[Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException]                                       
  Circular reference detected for service "form_builder.signal.service.form", path: "ezpublish.spi.persistence.legacy.cont  
  ent_type.handler.caching -> ezpublish.spi.persistence.legacy.content_type.handler.inner -> ezpublish.persistence.legacy.  
  content_type.mapper -> ezpublish.persistence.legacy.field_value_converter.registry -> ezpublish.fieldtype.ezlandingpage.  
  legacy_converter -> ezpublish.fieldtype.ezlandingpage.xml_converter -> ezpublish.landing_page.registry.block_type -> ez_  
  systems.landing_page.block.form_builder -> form_builder.signal.service.form -> ezpublish.signalslot.signal_dispatcher ->  
   form_builder.signal.event_content_update"