# VIEWER_CODE_UNKNOWN

**What it means.** No app has this code.

**What to do.** Check the six letters and numbers, or scan the code again. A code looks like HK7QM2.

- HTTP status: 404
- Retryable after applying the fix: yes

Every failure from the CLI or an MCP tool has this shape:

```json
{
  "ok": false,
  "code": "VIEWER_CODE_UNKNOWN",
  "message": "No app has this code.",
  "fix": "Check the six letters and numbers, or scan the code again. A code looks like HK7QM2.",
  "file": "<where to edit, when known>",
  "retryable": true,
  "docs": "https://docs.uarpie.app/errors/VIEWER_CODE_UNKNOWN"
}
```

Apply `fix` (edit `file` when it is given), then run the same command again.