> ## 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**](https://praison.ai/docs/sdk/reference/praisonaiagents/modules/protocols.md) module.

AI Agent

Raised when a requested backend is not available.

## Constructor

**backend** `str` *required*

No description available.

**reason** `str`

No description available.

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/knowledge/protocols.py#L224)
>
> `praisonaiagents/knowledge/protocols.py` at line 224


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