message: add target
diff: "type": "string",
  "description": "[DEPRECATED] Error message."
  },
  + "target": {
  + "type": "string",
  + "description": "[DEPRECATED] Error target."
  + },
  "details": {
  "type": "array",
  "description": "[DEPRECATED] An array of error detail objects.",
  "type": "string",
  "description": "Error message."
  },
  + "target": {
  + "type": "string",
  + "description": "Error target."
  + },
  "details": {
  "type": "array",
  "description": "An array of error detail objects.",
  