> ## 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.

# Backend Not Available Error • AI Agent SDK

> BackendNotAvailableError: Raised when a requested backend is not available.

# BackendNotAvailableError

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

<Badge color="blue">AI Agent</Badge>

Raised when a requested backend is not available.

## Constructor

<ParamField query="backend" type="str" required={true}>
  No description available.
</ParamField>

<ParamField query="reason" type="str" required={false}>
  No description available.
</ParamField>

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/knowledge/protocols.py#L224">
  `praisonaiagents/knowledge/protocols.py` at line 224
</Card>