things:acl.invalid

{
  "topic": "unknown/unknown/things/twin/errors",
  "headers": {},
  "path": "/",
  "value": {
    "status": 400,
    "error": "things:acl.invalid",
    "message": "The Access Control List of the Thing with ID 'com.acme:xdk_53' is invalid.",
    "description": "There always has to be at least one ACL Entry with <READ, WRITE, ADMINISTRATE> permissions."
  },
  "status": 400
}