# Notification settings invalid for a simulation

You're trying to run a simulation with an invalid notification setting.

---

## Example

```json
{
  "error": {
    "type": "request_error",
    "code": "notification_simulation_run_notification_settings_conflict",
    "detail": "Simulations with an invalid notification setting cannot be run.",
    "documentation_url": "https://developer.paddle.com/errors/notifications/notification_simulation_run_notification_settings_conflict"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}
```

## Details

| Attribute | Value |
| --- | --- |
| Status code | 409 |
| Error code | `notification_simulation_run_notification_settings_conflict` |
| Error message | Simulations with an invalid notification setting cannot be run. |

## Common causes

- You're trying to run a simulation with an invalid notification setting. A notification setting may have been updated recently so that it no longer accepts simulated traffic.

## Common solutions

- Update a notification setting so that it's valid, then try your run again.