# campaign_too_large

- HTTP status: 422
- Retry: No
- Execution: not started
- Admin needed: no

**Campaign too large.** A single run can carry a limited number of recipients, and a resume can re-screen a limited number of remaining recipients. Retrying will not help: split the audience across several campaigns.

## What it means

The API returns HTTP 422 with `error.code` set to `campaign_too_large`. The default message is: "This campaign has too many recipients to start in one run."

## Common causes

- The recipient list is larger than one run accepts (start).
- Too many recipients remain to re-screen before a resume (resume).

## How to identify it

Check the response status (`422`) and `error.code` (`campaign_too_large`). Branch on `error.code`, not on the message text: messages can be reworded, codes do not change within v1. Log `error.request_id` (also sent as the `X-Request-Id` header) so support can find the request.

## How to fix it

- Start: split recipients across several campaigns.
- Resume: list the recipients still `pending`, create new campaigns of them in smaller parts, start those, and stop this campaign (stopping does not hang up calls in progress).

## Retry guidance

Sending the request unchanged fails the same way. Fix the cause first (see How to fix it), then send it again.

## Did anything happen?

This request was refused before any call was placed and before anything was charged.

## Idempotency

Nothing was done and the refusal is not stored under the Idempotency-Key. Fix the cause, then send the same request (with the same key if you sent one).

## Who can fix it

The developer who sends the request can fix it; no administrator action is normally needed.

## When to contact support

If the error persists after the steps above, contact [support@relationsai.com](mailto:support@relationsai.com). See [Support](/resources/support) for what to include (the `request_id`, the time in UTC, the operation, and whether you used a test or live key) and what never to send (API keys, Authorization headers, webhook signing secrets, recording links, transcripts or customer data).

## Example error response

```json
{
  "error": {
    "code": "campaign_too_large",
    "message": "This campaign has too many recipients to start in one run.",
    "details": {},
    "request_id": "req_gis2j6iczk7wnvfjsz2ll7uy",
    "retry": "no",
    "doc_url": "https://docs.relationsai.com/errors/campaign_too_large"
  }
}
```

## Operations that can return this error

- [`POST /campaigns/{campaign_id}/start`](/api/campaigns#start-a-campaign): Start a campaign
- [`POST /campaigns/{campaign_id}/resume`](/api/campaigns#resume-a-campaign): Resume a campaign

See all codes in the [error-code reference](/fundamentals/error-codes).