Default value and the the predefined type of properties do not match.

Here's an example below. The default value is a dict while type is defined as string.

org.openecomp.resource.vf.Vmme:
  derived_from: org.openecomp.resource.abstract.nodes.VF
  properties:
    nf_naming:
      type: org.openecomp.datatypes.Naming
      default:
        ecomp_generated_naming: true
    nf_naming_code:
      type: string 
      default: {   
        }