Error: HTTP 400 – { error: { message:Missing required parameter: ‘model’., type:invalid_request_error, param:model, code:missing_required_parameter } }

Error: HTTP 400 – {
“error”: {
“message”: “Missing required parameter: ‘model’.”,
“type”: “invalid_request_error”,
“param”: “model”,
“code”: “missing_required_parameter”
}
}