# Errors

> Every error the endpoint can return, what causes it and how to fix it.

Source: https://docs.formclick.io/api-reference/errors

| Status | Message | Cause and fix |
| --- | --- | --- |
| `400` | Missing access key | No `access_key` field and no key in the URL. Add the hidden field. |
| `400` | Invalid access key | The key is not a valid UUID. Copy it again from the Connect tab. |
| `400` | Submission is empty | Every field was blank. Check your inputs have `name` attributes. |
| `400` | Please complete the captcha. | The form has a captcha but no token was sent. See [reCAPTCHA](https://docs.formclick.io/html-forms/recaptcha) or [Turnstile](https://docs.formclick.io/html-forms/turnstile). |
| `400` | Captcha verification failed. Please try again. | The token was invalid, expired, already used, or the reCAPTCHA v3 score was too low. |
| `403` | Form is disabled | The form is turned off in your dashboard. |
| `403` | This form doesn’t accept submissions from this website. | The form is [restricted to other domains](https://docs.formclick.io/html-forms/restrict-domain), or the request had no `Origin`/`Referer`. |
| `404` | Form not found | No form uses this key. It may have been deleted. |
| `413` | Submission is too large | The body is over 100 KB. Send files with [file uploads](https://docs.formclick.io/html-forms/file-uploads), not in text fields. |
| `429` | Too many submissions. Please try again later. | More than 5 submissions from one IP to this form in 10 minutes. |
| `500` | Internal server error | Something went wrong on our side. Try again; contact support if it continues. |
| `503` | We couldn’t verify the captcha. Please try again. | Google or Cloudflare didn’t respond in time. The visitor can simply resubmit. |

## Script-only errors

| Message | Cause |
| --- | --- |
| Configuration error: a valid Formclick access key is required… | `formclick.min.js` found no hidden `access_key` field, or the value is not a UUID. |
| “cv.pdf” exceeds the 5 MB size limit. | A file is larger than 5 MB. |
| “photo.heic” is not an accepted file type. | The file does not match the input’s `accept` attribute. |

> **Note:** Honeypot hits and duplicate submissions return success on purpose, so bots and double-clicks get no signal.