# missing_param

URL: /evidence/errors/missing_param · Id: `error:missing_param`

> A required parameter is missing.

The `missing_param` [Problem](/evidence/errors) means: a required parameter is missing.

## Answer
| Status | Title |
| --- | --- |
| 400 | Bad Request |

```json
{
  "type": "about:blank",
  "title": "Bad Request",
  "status": 400,
  "detail": "What went wrong, in words.",
  "code": "missing_param"
}
```

## Fix
Send every parameter the operation marks as required.