invoiceninja/app/Http/Controllers/OpenAPI/ErrorSchema.php

<?php
/**
 * @OA\Schema(
 *   schema="Error",
 *   type="object",
 *       @OA\Property(property="message", type="string", example="Unexpected error", description="The company name"),
 *       @OA\Property(property="code", type="integer", example="500", description="The HTTP error code"),
 * )
 */