{
  "code": 21,
  "class": "Twilio REST",
  "subclasses": [
    {
      "code": 2,
      "class": "TwiML",
      "errors": [
        {
          "code": 18,
          "name": "InvalidApplicationSid",
          "description": "Invalid ApplicationSid",
          "explanation": "You attempted to initiate an outbound phone call with an invalid ApplicationSid. The application may not exist anymore or may not be available within your account"
        }
      ]
    }
  ]
}