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# E204

# Reserved Field Name

## Erroneous Code Example

This error occurs when you try to use a reserved field name in your schema or query.

For example, the field `id` is a reserved field name for any item type.

<CodeGroup>
  ```rust schema.hx theme={null}
  N::User {
      id: String,
  }
  ```
</CodeGroup>

## Solution

Rename the field to a valid identifier.

<CodeGroup>
  ```rust schema.hx theme={null}
  N::User {
      github_id: String,
  }
  ```
</CodeGroup>