> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Scope Required Error • Rust AI Agent SDK

> ScopeRequiredError: Scope required error.

# ScopeRequiredError

> Defined in the [**knowledge**](../modules/knowledge) module.

<Badge color="orange">Rust AI Agent SDK</Badge>

Scope required error.

## Fields

| Name      | Type                   | Description  |
| --------- | ---------------------- | ------------ |
| `backend` | `Option&lt;String&gt;` | Backend name |

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-rust/praisonai/src/knowledge/mod.rs#L921">
  `praisonai/src/knowledge/mod.rs` at line 921
</Card>

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## Related Documentation

<CardGroup cols={2}>
  <Card title="Rust Error Handling" icon="triangle-exclamation" href="/docs/rust/error-handling" />

  <Card title="Rust Retry" icon="rotate-right" href="/docs/rust/retry" />

  <Card title="Rust Failover" icon="shield" href="/docs/rust/failover" />

  <Card title="Rust Agent UI" icon="display" href="/docs/rust/agent-ui-agui" />

  <Card title="Rust AGUI" icon="display" href="/docs/rust/agui" />
</CardGroup>